Description & Operation: Speedometer/Odometer
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.
Speedometer uses disc-type dial indicator display, which is lighted by electronic quartz crystals. Odometer uses electronically driven numerical wheels to display mileage. Speedometer/odometer receives its signals from the Digital Ratio Adapter Controller (DRAC). The DRAC receives its input signals from the VSS, located in transmission tailshaft housing.