Faria Beede Instruments White 2" Fuel Level Gauge E-1/2-F Euro. 0625" (53mm) Fuel Level gauge operates by sending a low amperage current through the gauges's meter to ground via a sending unit with variable resistance. The resistance of the sending units increase or decrease with the changes in pressure temperature etc... 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. Specifications for Faria Beede Instruments Euro White 2" Fuel Level Gauge E-1/2-F: Manufacturer: Faria Beede Instruments Color: White Features of Faria Beede Instruments Euro White 2" Fuel Level Gauge E-1/2-F Color: White Gauge size 2 inches Operates on low amperage Designed for quick and simple installation Package Contents: Faria Beede Instruments Euro White 2" Fuel Level Gauge E-1/2-F Faria Beede Instruments 12901: White 2" Fuel Level Gauge E-1/2-F Euro