INSTRUMENT CLUSTER GAGE REPLACEMENT

MODELS: 1988 C/K MODELS

GAGE REPLACEMENT

The 1988 C/K instrument cluster gage assem- blies are now serviced by GMSPO.

PARTS INFORMATION

GAGE PART NUMBER ---- ------------ Temperature 240 (Diesel) 25034507 Temperature 260 (Gas) 25034503 Oil Pressure 60 PSI (Gas) 25026334 Oil Pressure 80 PSI (Diesel) 25026838 Voltmeter 6474938 Fuel Gage 6434333 Speedometer 25079690

The instrument cluster gage replacement procedure is outlined in Section 8C-13 of the 1988 C/K Service Manual.

NOTICE: AC Delco will continue to exchange complete instrument clusters as out lined in GMC Truck Service Bulletin 88-T-5/Chevrolet Bulletin 88-06. Complete instrument cluster replacement will be required for electrical circuitry or odometer failures.

RECALIBRATION FOR CHANGE IN TIRE SIZE OR AXLE RATIO

If the vehicle tire size or axle ratio is changed, the speedometer must be recalibrated for accuracy. Use speedometer calibration service kit Part Number 25085515, which consists of connector, two clips and usage instructions. The connector can be used ten times. Clips are available in packages of 20, Part Number 25085993.

Complete speedometer calibration instructions are in Section 5A3-22 of the 1988 C/K Service Manual.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.