Instrument Cluster
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1991 GMC Pickup, 1991 GMC Cab & Chassis, 1991 GMC C3500 HD, 1991 Chevrolet Pickup, and 1991 Chevrolet Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Static electricity can destroy integrated circuits within instrument cluster. Before servicing, ground yourself and work area to discharge stored electricity.
Disconnect negative battery cable. Remove radio and heater control units. Remove 4 retainer screws. Remove trim plate (A/T only). Touch hands to ground to discharge static electricity before removing instrument cluster. Being extremely careful NOT to touch circuit board pins, disconnect 34-pin connector. To install, reverse removal procedure.