Cruise Control Systems: Description
System uses manifold vacuum to power a throttle servo unit. When speed adjustment is necessary, servo moves the throttle by receiving a varying amount of controlled vacuum from a transducer unit. Speedometer cable (from transmission) drives transducer, and a cable from transducer drives speedometer. Transducer is activated by a three-position switch located at end of turn signal lever. In addition, Cadillac and Oldsmobile models have an ON-OFF switch on dashboard (to completely shut system off).