The Fule Tank Sending Unit with American standard output 240-33 ohms (240 ohms at empty, 33 ohms at full).Wide Application: The Fule Tank Sending Unit is suitable for Boat, Auto,Trucks, Buses and Marine. It Could Support Fuel Level Gauge and Water Level Gauge for Boat/Auto.High Quality Material: Fuel tank sending unit is made with heavy duty 316 stainless steel. This water level sensor is reed switch, durability and reliability, steady output signal. No Adjustment Needed for Tank.Easy to Install: The fuel level sending unit is equipped with gaskets, installation screws, and good written and illustrated instructions.High Quality Material: Fuel tank sending unit is made with heavy duty 316 stainless steel. This water level sensor is reed switch, durability and reliability, steady output signal. No Adjustment Needed for Tank.