Section 107 (Instrument Panel - C/K Series Pickups): Adjustments: Notes
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:
DO NOT touch calibration clip pins at back of instrument cluster as immediate electrostatic discharge damage to cluster will result.
NOTE:
Speedometer must be replaced or recalibrated when rear axle ratio or tire size is changed.
NOTE:
The calibration connector from Service Kit (25085515) should be used a maximum of 10 times. If speedometer has been previously recalibrated, it is not necessary to perform step 1. Follow instructions provided with service kit.