The switch is on the bottom, as I recall, of the the power steering pump. In the mounting bracket there is a hole for the switch to come through. The wire is routed up the back of the pump and difficult to see or find. It does have an electrical connector that you can simply disconnect and see if that improves your idle.

Good luck, I didn't see it and pulled the wire out of the sensor when I removed the engine after double and triple checking all the wires connected to the motor.

Dan