I/P PRINTED CIRCUIT & GAUGE NEW DESIGN FOR 1987

THE INSTRUMENT PANEL PRINTED CIRCUIT AND ATTACHING GAGES HAVE BEEN REDESIGNED FOR 1987 S/T TRUCKS EQUIPPED WITH GAGES WITH OR WITHOUT A TACHOMETER. SMALLER TRACES ON THE PRINTED CIRCUIT BRING THE REDESIGNED CIRCUIT WITHIN THE BOUNDARY OF THE INSTRUMENT CLUSTER CASE REAR SURFACE, THUS REDUCING THE CHANCES OF DAMAGING THE CIRCUIT DURING ASSEMBLY OR SERVICING. THE GAGE ASSEMBLIES HAVE BEEN REVISED TO IMPROVE THE ELECTRICAL CONNECTIONS BETWEEN THE GAGES AND PRINTED CIRCUIT. INSTRUMENT CLUSTERS FOR 1986 AND 1987 MODELS ARE INTERCHANGEABLE IN THEIR ENTIRETY, BUT THE PRINTED CIRCUITS AND GAGES ARE NOT INTERCHANGEABLE BETWEEN MODEL YEARS. A SMALL NUMBER OF EARLY 1987 TRUCKS MAY HAVE CARRYOVER 1986 S/T INSTRUMENT CLUSTERS, THUS IT WILL BE NECESSARY TO CHECK THE CLUSTER PART NUMBER PRIOR TO REPLACING ANY COMPONENTS. THE INSTRUMENT CLUSTER WITH GAGES AND THE INSTRUMENT CLUSTER WITH GAGES AND A 2.8L TACHOMETER WILL BE AVAILABLE AS SERVICE PARTS. THE INSTRUMENT CLUSTER WITH GAGES AND A 2.5L TACHOMETER WILL NOT BE RELEASED AS A SERVICE PART. THE TACHOMETER, RETAINER AND DIAL FOR THE CLUSTER WITH 2.8L TACHOMETER CAN BE REPLACED WITH THE 2.5L TACHOMETER, RETAINER AND DIAL. INSTRUMENT CLUSTERS WITHOUT GAGES DID NOT CHANGE BETWEEN 1986 AND 1987 MODEL YEARS. THE NEW PART NUMBERS FOR 1987 MODELS ARE AS FOLLOWS: DESCRIPTION PART NUMBER ----------- ----------- INSTRUMENT CLUSTER WITH GAGES 25086156 INSTRUMENT CLUSTER WITH GAGES 25086158 AND 2.8L TACHOMETER INSTRUMENT CLUSTER WITH GAGES AND 2.5L TACHOMETER * 2.5L TACHOMETER 25058628 RETAINER, WITH DIAL 25079511 PRINTED CIRCUIT WITH GAGES 25086195 PRINTED CIRCUIT WITH GAGES 25086196 AND TACHOMETER GAGE ASSEMBLY - FUEL 6434626 GAGE ASSEMBLY - VOLT 6475017 GAGE ASSEMBLY - OIL (PSI) 25026585 GAGE ASSEMBLY - TEMPERATURE 25034745 (0 DEGREES F) INSTRUMENT CLUSTERS WITHOUT GAGES DID NOT CHANGE BETWEEN 1986 AND 1987 MODEL YEARS. * THE INSTRUMENT CLUSTER WITH GAGES AND 2.8L TACHOMETER IS REQUIRED. ***GMC TRUCK DISCLAIMER***

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.