Faria Beede Instruments Chesapeake Fuel Level Gauge SS 2" Black. The resistance of the sending units increase or decrease with the changes in pressure temperature ect. As the sender's resistance varies the amount of current allowed to flow through it to ground changes and the meter deflects showing the level of fuel. Features of Faria Beede Instruments Chesapeake Fuel Level Gauge SS 2" Color: White Easy to read display Durable design for marine use Designed for quick and simple installation Package Contents: Faria Beede Instruments Chesapeake Fuel Level Gauge SS 2" Faria Beede Instruments 13721: Chesapeake Fuel Level Gauge SS 2" Black