The diagrams and photos show how to wire up the fuel pump and oil-pressure switch to a commonly available, industry standard, ISO-type "1 Form C single pole/double throw" (SPDT) relay.

Replace a cranky old switch in about an hour. Switches come in three pressure ranges: 20 to 40, 30 to 50 and 40 to 60 pounds per square inch (psi).

The switches can be wired for line or low voltage. The fan side will always be line voltage since the fan motor is 120 V. I prefer to wire the limit side for 120 V and feed the hot wire on the line ...

Solid-state construction resists the damage that shock and vibration cause to mechanical switch units and delivers more than 100 million switch actuation cycles. Pressure ranges are from 0 to ...