Engine Speed Switch
Switch determines engine RPM and completes electrical circuit to 3-way solenoid when more than 1000 RPM (Federal) or 1100 RPM (Calif.) is sensed.
NOTE:
On models with air conditioning, the air conditioning relay is in-line ahead of engine speed switch. Whenever A/C is in on position, this relay will activate throttle positioner system, allowing slightly higher idle speeds.