Air Dog 901-04-0003-3 Low Fuel Pressure Warning Light KitLow pressure warning light kit for 100GPH & 150GPH AirDog kits. The AirDog indicator light will illuminate if fuel pressure drops below 5 PSI at the sensor. Great insurance against engine failure or fuel system failure. Let you know if you filters are plugged full or lift pump failure. This kit is designed for Airdog systems but can be used with other system. Featuring an 1/8" NPT sender.