This patent-pending design enables integration of the return line found on diesel and some fuel injection engines.Converting a gasoline tank to diesel use You'll need a fitting that allows you to connect a fuel return line. This design meets that requirement.Designed for all types of marine vessels, this Universal Swingarm Electric Sending Unit top-mounts in aluminum, plastic or stainless steel fuel tanks. The all-stainless steel construction resists corrosion and is unaffected by E-10 fuel. The sender gathers fuel level information from a float which is read on a dash-mounted gauge (sold separately).Key FeaturesIncludes fuel gauge float, sending unit and 5-hole gasket with screwsFits tanks 12" to 24" deepFloat rotates easily in 90 increments for tank wall and baffle clearanceAll-stainless steel constructionInternal components will not rust or corrode1/4" female NPT thread with 3/8" barb1/4" ground spade terminalPre-bent 90 float armCalibration to 33-240 ohmsDash-mounted gauge sold separatelyMeets or exceeds NMMA and ABYC specificationsThree-year limited warranty