Chesapeake White SS 2" Fuel Level Gauge - Metric (E-1/2-F)Perimeter-lighted White dial with stylish Blue and White graphics, polished stainless steel bezel, contoured White pointer and domed glass lens.Fuel Level gauge operates by sending a low amperage current through the gauge&';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.2" - Hole Size: 2.0625" (53mm)Specifications: Metric Anti-scratch glass lens Plastic Cases for corrosion resistance and long life 12 VDC negative ground Can be adapted for 24 VDC systems Factory P/N GP9791*Sold as an Individual**Gauge Cover not IncludedThis product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns. Specifications: Gauge Type: Fuel Level Gauge Size: 2" Box Set: No Series: Chesapeake White Voltage - Input Range (Volts): 12/24 V Box Dimensions: 4"H x 4"W x 5"L WT: 0.3 lbs UPC: 759266138186 Owner&';s Manual (pdf)