Description:Cat® Sender supplies signal to the gauge, which then displays on the dial. Cat Sending unit is located in the fuel tank. It consists of a float, usually made of foam, connected to a thin, metal rod. The end of the rod is mounted to a variable resistor which is then used to measure the fuel level.Application:Cat® Sender are used based on specific application. Consult your owner's manual or contact your local Cat Dealer for more information.