Bosch® Tachometer Installation Instructions
Contents
1. v RED LINE SHIFT POINTER Adjust the RED LINE SHIFT POINTER by sliding it around the meter bezel see figure 2 This pointer may be set at any point on the meter scale such as engine red line or transmission shift point FUNCTIONAL QUICK CHECK Although every attempt has been made to make this tachometer electronically compatible with as many different ignition systems as possible new ignition systems are being developed continually It is suggested especially if you have an engine that has a non OEM or aftermarket ignition system that the tachometer be electrically connected to the vehicle using alligator clip leads or other suitable means following the steps below and an electrical functional check of the tachometer be made prior to making a permanent installation 1 Clip the BLACK lead from the tachometer to the negative battery terminal 2 Clip the RED lead from the tachometer to the positive battery terminal 3 Clip the GREEN lead from the tachometer to the negative side of the ignition coil or tach signal connection point as indicated in the ELECTRICAL CONNECTIONS section of this manual Do not allow this connec tion to touch ground 4 The WHITE lead is for instrument panel lighting and need not be connected for this check 5 When all connections are secure start the vehicle s engine Confirm the operation of the tachometer throughout the operating temperature range of2. Securing them with nylon tie wraps not included is suggested Do not route wires along or against sharp edges which could cut the insulation Also do not route them along hot engine surfac es such as exhaust manifolds where high temperature could melt the insulation or near spark plug wires Route wires through an existing hole in the firewall or drill a 3 8 hole where desired making sure there are no hidden wires hoses etc that could be damaged Insert the sup plied rubber grommet in this hole for added protection against wire damage or shorting see figure 5 FIGURE 5 RUBBER GROMMET FIGURE 6 ELECTRICAL D A os ZA AP A CONNECTOR CRIMP ENDS PIERCING CONNECTOR CLIP LIP UNLOCKED TACHOMETER WIRE SPLICE D f CONNECTOR VEHICLE LOCKED HARNESS WIRE FUSE BOX RED TO BATT VOLTAGE TERMINAL Jer BLACK WIRE TO GROUND 1 Connect the BLACK wire to the negative battery terminal or a clean unpainted chassis ground using a ring terminal or other suitable means see figure 7 IMPORTANT Although electrical ground BLACK wire connection is available under the dashboard grounding the instrument near or under the dash may cause it to operate erratically as any ground connection other than the nega tive battery terminal may be electrically noisy Make the following connections with splice connectors or by an alternative method if desired see figure
3. PARTS Be very careful not to get your hands hair or clothes near any moving parts such as fan blades belts and pulleys or throttle and transmission linkages Never wear neckties or loose clothing when working on your Car JEWELRY Never wear wrist watches rings or other jewelry when working on your car You ll avoid the possibility of catching on moving parts or causing an electrical short circuit which could shock or burn you VENTILATION The carbon monoxide in exhaust gas is highly toxic To avoid asphyxiation always operate vehicle in a well ventilated area If vehicle is in an enclosed area exhaust should be routed directly to the outside via leakproof exhaust hose SETTING THE BRAKE Make sure that your car is in Park or Neutral and that the parking brake is firmly set NOTE Some vehicles have an automatic release on the parking brake when the gear shift lever is removed from the PARK position This feature must be disabled when it is necessary for testing to have the parking brake engaged when in the DRIVE position Refer to your vehicle service manual for more information HOT SURFACES Avoid contact with hot surfaces such as exhaust manifolds and pipes mufflers catalytic converters radiator and hoses Never remove the radiator cap while the engine is hot as escaping coolant under pressure may seriously burn you SMOKING AND OPEN FLAMES Never smoke while working on your car Gasoline vapor is h
4. flat and lockwashers is recommended CAUTION This unit is designed for use on twelve 12 volt negative ground four 4 cycle automotive type engines It is not designed for use on positive ground electrical systems two 2 cycle engines aircraft or marine applications It is compatible with most distributor equipped and distributorless ignition systems SUGGESTED TOOLS Wire and terminal crimping stripping and cutting tool s Screwdrivers and nut drivers as required by hardware used Small open end wrench set 1 4 to 3 8 sizes may be required Electric drill Drill bits 29 or 9 64 18 or 11 64 5 16 3 8 BOSCH FIGURE 1 CYLINDER SELECTION This tachometer should be checked for cylinder setting before installation see figure 1 Position the CYLinder selector switch on the rear of the tachometer so that the switch actuator is op posite the number which matches the number of cylinders in the engine For Chrysler DISTRIBUTORLESS IGNITION SYSTEM CONNECTIONS connection to Pin 43 of the Single Board Engine Controller on Distributorless Ignition equipped Chrysler vehicles requires that the CYLinder selector switch be set to the four 4 cylinder position regardless of the number of cylinders in the engine LAMP SUBSTITUTION OR RE PLACEMENT Your tachometer is supplied with an automo tive type wedge base full size tachometers or subminiature wedge base mini tachom
5. 6 2 Connect the RED wire to any vehicle har ness wire which is energized with battery voltage ONLY when the ignition key is in the ON RUN position NOT OFF or ACCES SORIES see figures 6 and 7 3 Connect the WHITE wire to the instrument panel lighting circuit or any lead that is controlled by the instrument panel dimmer control see figure 7 NOTE Some vehicles typically imported wire the dimmer control into the ground side of the instrument panel lighting circuit as opposed to the more conventional hot or twelve 12 volt side In vehicles which use this circuit connect the WHITE wire to a circuit which is energized by the headlamp switch INSTRUMENT ae l LAMP engine is equipped with a equipped with a DISTRIB UTOR IGNITION SYSTEM proceed to the GREEN WIRE CONNECTION DISTRIBUTOR EQUIPPED ENGINES section in this manual If your vehicle s RGS DIS DISTRIBUTORLESS IGNITION SYSTEM pro ceed to the GREEN WIRE CONNECTION DISTRIBU TORLESS IGNITION SYS TEM EQUIPPED ENGINES section of this manual DIS equipped engines are char acterized by their lack of an ignition distributor In place of the distributor will be one or more ignition coil packs Unlike the ignition distributor which has a basically round shape the coil pack is typi cally a square or rectangular package GREEN WIRE CONNECTION DISTRIBUTOR EQUIPPED ENGINES Connect the GREEN wire to the negative side of the i
6. RPM x 1000 TACHOMETER INSTALLATION INSTRUCTIONS GENERAL INFORMATION Please read this instruction manual and review the installation procedures carefully before attempting the installation of your tachometer NOTE If additional wire is needed use 18 or 20 AWG stranded automotive primary wire For exposed underhood wiring teflon insulated wire with its associated high temperature ca pability is recommended Additional connec tors and hardware that are not included with SAFETY GUIDELINES To prevent accidents that could result in serious injury and or damage to your vehicle or test equipment carefully follow these safety rules and test procedures SAFETY EQUIPMENT Fire Extinguisher Never work on your car without having a suitable fire extinguisher handy A 5 Ib or larger CO or dry chemical unit specified for gasoline chemical electrical fires is recommended Fireproof Container Rags and flammable liquids should be stored only in fireproof closed metal containers A gasoline soaked rag should be allowed to dry thoroughly outdoors before being discarded Safety Goggles We recommend wearing safety goggles when working on your car to protect your eyes from battery acid gasoline and dust and dirt flying off moving engine parts NOTE Never look directly into the carburetor throat while the engine is cranking or running as sudden backfire can cause burns LOOSE CLOTHING AND LONG HAIR MOVING
7. e ters lamp for illumination This lamp should provide satisfactory illumination intensity in most applications however the following substitute lamps are available at your local auto parts store and may allow you to custom tailor the illumination characteristics of the ta chometer to your application Note the higher the MSCD Mean Spherical Candela of the lamp the brighter it is LAMP MSCD COLOR BASE 73 3 CLEAR SUBMINIATURE WEDGE 37 5 CLEAR SUBMINIATURE WEDGE 74 15 CLEAR SUBMINIATURE WEDGE 161 1 CLEAR WEDGE 194 2 CLEAR WEDGE 194A AMBER COATED WEDGE 168 3 CLEAR WEDGE The lamp socket is located at the top rear of the tachometer see figure 1 To remove the lamp gently grasp the black lamp socket use pliers if necessary and twist it counterclockwise approxi mately 1 8 turn until it stops Pull the socket with lamp straight out of the tachometer housing Remove the lamp from its socket by pulling it straight out Replace the lamp as required following the chart above Reinstall the socketed lamp by rotating it against the tachometer s PC board until it drops into place and then rotate it approximately 1 8 turn clockwise until it reaches its mechanical stop WARNING SAFETY PRECAUTION Neither the driver nor any passenger should compromise the safe operation of the vehicle by attempting to readjust the tachometer in any way while the vehicle is in motion FIGURE 2 RED LINE 1 POINTER
8. gnition coil This terminal may also be referred to as the TACH TACH TEST DEC or ECU terminal Wiring diagrams can be found in your vehicle service manual See the list at the end of these instructions for service manual sources GREEN WIRE CONNECTION DISTRIBUTORLESS IGNITION SYSTEM EQUIPPED ENGINES Many domestically built vehicles and some imports are now using a new type of ignition system which does not use a distributor but instead a system of multiple ignition coils and the necessary sensors and computer controls to fire them in the proper order This type of system is commonly referred to as a DISTRIBUTORLESS IGNITION SYSTEM or DIS Your tachometer is designed to work with these systems however proper connection to them is important The BLACK ground RED 12 14 volt supply and WHITE instrument lamp connections are the same as for distrib utor equipped vehicles however connection of the GREEN tach signal wire to the ignition is specific to the engine and ignition system Wiring diagrams can be found in your vehicle service manual See the list at the end of these instructions for service manual sources
9. ighly flammable and the gas formed in a charging battery is explosive BATTERY Do not lay tools or equipment on the battery Accidentally grounding the HOT battery terminal can shock or burn you and damage wiring the battery or your tools and testers Be careful of contact with battery acid It can burn holes in your clothing and burn your skin or eyes When operating any test instrument from an auxiliary battery connect a jumper wire between the negative terminal of the auxiliary battery and ground on the vehicle under test When working in a garage or other enclosed area auxiliary battery should be located at least 18 inches above the floor to minimize the possibility of igniting gasoline vapors HIGH VOLTAGE High voltage 30 000 to 50 000 volts is present in the ignition coil distributor cap ignition wires and spark plugs When handling ignition wires while the engine is running use insulated pliers to avoid a shock While not lethal a shock may cause you to jerk involuntarily and hurt yourself JACK The jack supplied with the vehicle should be used only for changing wheels Never crawl under car or run engine while vehicle is ona jack this unit may also be needed As the mounting configuration will vary significantly from vehi cle to vehicle hardware to mount the tachom eter to the vehicle is not included Whether you use self tapping or a machine screw and nut configuration 8 hardware including
10. ring columns Select a mounting location that allows a clear view of the tachometer but does not obstruct access or view of controls or view of other dashboard instruments or the road CAUTION Position the tachometer in its specific lo cation and determine wire routing and con nection locations before drilling any holes Be sure to check behind areas of intended drilling for obstructions before drilling Mark hole locations and drill holes as re quired per the following chart 8 Self tapping screws 29 or 9 64 drill bit 18 or 11 64 drill bit Clearance hole for wiring harness 5 16 drill bit 8 Machine screw hardware Once the tachometer is adjusted to its final position securely tighten all hardware FIGURE 3 FIGURE 4 GREEN WIRE TO INER CONNECTION SWITCH The GREEN wire provides the tachometer with the engine RPM speed signal If your vehicle s engine is ELECTRICAL CONNECTIONS Refer to your vehicle service manual while carefully following the wiring instructions FIGURE 7 SEE THE GREEN WIRE CONNECTION SECTIONS OF THIS MANUAL SPLICE NY CONNECTOR CAUTION For your own personal safety and to prevent possible damage to the electri cal system of your vehicle during the installation disconnect the negative battery cable Reconnect this cable after installation is complete BLACK RED AND WHITE WIRE CONNECTIONS ALL SYSTEMS Route all wires carefully
11. the engine and at both curb idle and higher engine speeds The tachometer should follow the speed of the engine smoothly and show no signs of erratic operation Should you encounter unsatisfactory tachometer operation erratic no reading etc on engines equipped with high performance and or after market ignition systems or ignition coils you may have selected the incorrect tach connection point for the tachometer s GREEN lead or a tachome ter filter assembly may be required Contact the manufacturer of the ignition system or ignition coil for information regarding tachometer connection to his product and or the availability of an elec trical filter assembly if required When you are satisfied with tachometer per formance proceed to the permanent installa tion instructions which follow MOUNTING THE TACHOMETER Your tachometer is designed to be mounted on top of or underneath the dashboard or on the steering column see figures 3 and 4 If you choose the steering column mounting configuration it will be necessary to obtain a hose clamp which is large enough in diam eter to encircle the steering column Cut off any excess strap from the hose clamp when clamp mounting is complete CAUTION Some steering columns are made to be collapsible upon impact Care should be taken when tightening the clamp to avoid damage to the column Be sure not to interfere with the movement or mechanism of adjustable tilt stee
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