Instruments - Odometer Replacement and Recalibration
87chevy26Number: 88-39
Section: 8C
Date: August, 1987
SUBJECT: INSTRUMENT CLUSTER GAUGE REPLACEMENT AND RECALIBRATION OF
ODOMETER FOR CHANGE IN TIRE SIZE/AXLE RATIO
MODELS: 1988 C/K MODELS
GAUGE REPLACEMENT
The 1988 C/K instrument cluster gauge assemblies are now serviced by GMSPO.
PARTS INFORMATION
GAUGE PART NUMBER
Temperature 240 (Diesel) 25034507
Temperature 260 (Gas) 25034503
Oil Pressure 60 PSI (Gas) 25026334
Oil Pressure 80 PSI (Diesel) 25026338
Voltmeter 6474938
Fuel Gauge 6434333
Speedometer 25079690
The instrument cluster gauge 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 outlined 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.