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GMC
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1989
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Forward Control 7.4 W, Standard
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Repair and Diagnosis
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Accessories & Equipment
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Gauges & Instrument Panels
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Instrument Panel - Standard & Electronic
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Adjustments
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Speedometer Calibration
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Notes
Speedometer Calibration: Notes
NOTE:
Do not touch pins at back of instrument cluster as immediate damage to cluster will occur. The DRAC must be replaced or recalibrated when rear axle ratio or tire size is changed.