Features: 1.Accurate Design: Accurate and precise transmission, stable signal transmission, giving you a good using experience. 2.Product Information: Heavy duty 316 stainless steel and sturdy construction. Signal output is 240 ohms?33 ohms, resolution range is 10mm, IP67 protection. 3.Application: Fuel sending unit is support fuel level gauge and water tank gauge for boat, RV, truck, yachts, which is versatile and practical. 4.Stable Performance: The main unit is made of 316 stainless steel, rust resistant and wear resistant, and can adapt to severe weather conditions. 5.Float Detail: The float is 1.38in (35mm) in diameter. If you must drill holes, a 1?1/2in (38mm) diameter hole would be perfect. Specification: Item Type: Fuel Water Level Sensor Material: Main Unit: 316 stainless steel Cable: PVC Float: NBR Mounting: Standard SAE 5 hole type Screw Size: M5 x 0.8 Hole Diameter: 5 mm / 0.20 inch Product Specification: 6in (150mm) Recommended tank size: 6.3in-7in (160-178mm) Output Signal: US standard 240-33ohms (240ohms at no load, 33ohms at full load) Resolution Range: Approx: 10mm/0.39in Fuel and Water Level Sensor Type: Resistance Alarm Switch Rated Current: 500mA Protection Level: IP67 Operating Temperature: -40F - +185F (-40C - +85C) Application: Ship, Yacht, Truck, RV PackageList: 1 x Fuel Water Level Sensor 5 x Screws 1 x Gasket Note: Kind tips: 1. This type of fuel tank sensor is 240?33 ohm, only suitable for 240?33 ohm fuel gauge. Please make sure your product is suitable for 240?33 ohms before purchasing. 2. When the oil level or water level is empty, there will be 3?15mm space between the sensor float and the bottom of the sensor. This is a safe distance and the fuel sender will work fine. 3. Please check the size and description of the product carefully before purchasing, if the fuel tank is plastic, the length of the gas tank liquid level sensor should be 1" smaller than the depth of the fuel tank, if the water tank is metal, the length of the liquid level sensor should be smaller than the depth of the fuel tank 0.5in?1in.