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Home >> GMC >> 1990 >> Forward Control 6.2 J, Automatic, 475/M40 >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel - Standard & Electronic >> Description & Operation >> Speedometer/Odometer Operation >> P, R & V Series

P, R & V Series

Speedometer is an air-core mechanical type gauge unit that is driven by an encased cable which is driven by a gear system located inside transmission tailshaft housing. Some vehicle applications require use of gear ratio reduction boxes at transmission speedometer cable connection to obtain proper calibration for speedometer.