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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 >> Astro, Safari, G, S & T Series

Astro, Safari, G, S & T Series

Integrated circuits control the needle type air core speedometer and the stepper motor driven odometer. Speedometer/odometer receives its signals from the Digital Ratio Adapter Controller (DRAC), which receives its input signals from the Vehicle Speed Sensor (VSS).