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Home >> GMC >> 1990 >> Forward Control 6.2 J, Automatic, 400/M40 >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel - Standard & Electronic >> Adjustments >> Speedometer Calibration Adjustment >> Notes

Speedometer Calibration Adjustment: Notes

CAUTION: On C and K Series, DO NOT touch calibration clip pins at back of instrument cluster as immediate electrostatic discharge damage to cluster will result.
NOTE: On all models, DRAC must be replaced or recalibrated when rear axle ratio or tire size are changed.