Oldsmobile (1966 Synchro-mesh) & Pontiac (1966 Auto. Trans. Cars)

With throttle valves wide open, measure distance from top of switch housing to top of switch sliding post. This distance should be 1 3/32". If this distance not correct, adjust by bending tang on operating lever up or down as required (see Fig 1).

Fig 1: VACUUM SWITCH ADJUSTMENT (TYPICAL)

Courtesy of GENERAL MOTORS COMPANY