The Fule/Water Level Sensor with American standard output 240-33 ohms (240 ohms at empty, 33 ohms at full). The well-written and illustrated instructions are straight forward that will easy to follow. Aazon.co: WATERWICH arine Fuel Sending Unit 12 Inch (300) Boat... No adjustment needed for tank. This water level sensor is reed switch, durability and reliability, steady output signal. RTILUR 5 Mrine Fuel Sending Unit - Stinless Kuwit The Fule/Water Level Sensor with American standard output 240-33 ohms (240 ohms at empty, 33 ohms at full). The fuel sending unit comes with 1 x Sensor, 1 x Gasket, 5 x Screws and 1 x instructions 🚘[Wide Application]: The fuel level sender is suitable for Boat, Auto,Trucks, Buses and Marine field. 🚙[American Standard Output]: Length range of fuel sender to choose: 5 inch-12inch. ⭐⭐⭐⭐⭐[Attention]: 1 inch(25mm) clearance must be maintained between the tank bottom and the float retaining collar in addition to adjacent side or baffle of tank. 12 Inch Stainless Steel Fuel Sensor ARTILAURA 240-33ohms 5" (125mm) , Boat Fuel Tank Fuel Sending Unit Please contact us if you are dissatisfied with our products, the response will be taken in 24 hours and provide proper solutions.