Faria Beede Instruments 2" Fuel Level Gauge Metric - Euro Black. 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 2" Fuel Level Gauge Metric: Manufacturer: Faria Beede Instruments Color: Black Features of Faria Beede Instruments 2" Fuel Level Gauge Metric Color: White Gauge size 2 inches Operates on low amperage Designed for quick and simple installation Metric Units Package Contents: Faria Beede Instruments 2" Fuel Level Gauge Metric Faria Beede Instruments 12802: 2" Fuel Level Gauge Metric - Euro Black