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Speedometer Calibration

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.
  1. Remove instrument cluster from vehicle. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Plug speedometer calibration connector from Service Kit (25085515) into back of instrument cluster, and momentarily touch calibration connector wires to battery terminals. See Fig 1 and Fig 2 .
  2. Use vehicle axle ratio, tire size and tread type to determine appropriate pins to remove from calibration clip. Pins are numbered 1 through 8 from top (rectangular end) to bottom (tapered end). See Fig 1.
  3. Remove pins by bending them back and forth using long needle-nose pliers. Insert modified calibration clip into 8 holes in rectangular slot on back of instrument cluster. See Fig 2. Install cluster in vehicle.
Fig 1: Identifying Speedometer Calibration Components
G117161Courtesy of GENERAL MOTORS CORP.
Fig 2: Exploded View of Speedometer Calibration Service Kit Components & Locations
G90E14930Courtesy of GENERAL MOTORS CORP.
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