Faria Beede Instruments Dress Fuel Level Gauge Metric 2" White. 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. Features of Faria Beede Instruments Dress Fuel Level Gauge Metric 2" High quality marine durable materials Easy to read display Gauge size 2 inches Designed for quick and simple installation Metric Units Package Contents: Faria Beede Instruments Dress Fuel Level Gauge Metric 2" Faria Beede Instruments 13117: Dress Fuel Level Gauge Metric 2" White