Moeller Marine Swingarm Electric Fuel Sending Units These Moeller Swingarm Fuel Sending Units gather fuel level information from a float which is read on a dash-mounted gauge. These units have been pre-inspected to guarantee full range of calibrated readings and are designed for gasoline applications. Internal components will not rust or corrode. Float rotates easily in 90 degree increments for tank wall baffle clearance. Designed for use in gasoline or diesel, not intended for use in water. Ca