Keeping you Ready for the Road Ahead , the Dorman Fuel Tank Sending Unit includes an arm, float and a resistor that adjusts according to the float’s position. This heavy duty indicator works to oversee sending the sensor signal that operates the instrument cluster’s fuel level gauge. Don’t get stuck on the side of the road with an empty tank. With this direct replacement heavy duty fuel sender replacement, you will know exactly how much fuel is in your tank. FleetPride is your First Click in Heavy Duty .