K 2500 Truck 4WD V8-379 6.2L DSL (1988)
Instrument Cluster / Carrier: All Technical Service Bulletins
Instrument - Gauge & Odometer Replacement/Recalibration
GMC NUMBER:
88-T-31
GROUP:
8C - Instrument Panel & Gage
DATE:
August, 1987
CORPORATE
NUMBER:
868302
SUBJECT:
INSTRUMENT CLUSTER GAGE REPLACEMENT AND RECALIBRATION OF
ODOMETER FOR CHANGE IN TIRE SIZE/AXLE RATIO
MODELS:
1988 C/K MODELS
GAGE REPLACEMENT
The 1988 C/K instrument cluster gage assemblies 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)
25026338
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 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.
