A recommended safety feature when using an electric fuel pump, this switch automatically cuts power to the pump when oil pressure is lost to help reduce the fire hazard in case of an accident that causes the engine to stop running. Similar switches are installed in some production vehicles as original equipment. Factory setting is 12psi. Installs in a 1/8 NPT thread.
Pressure below 12 psi: OFF (Circuit open)
Pressure above 12 psi: ON (Circuit closed)
Note: An Accusump or dry-sump system is highly recommended in competition cars using this switch to prevent a brief loss of oil pressure in a turn from causing the car to stall.