Chesapeake Black 2" Fuel Level Gauge (E-1/2-F)Perimeter-lighted Black 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 gauges 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: Anti-scratch glass lens Perimeter lighted back light 12 VDC negative ground Can be adapted for 24 VDC systems Factory P/N GP9368*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 Series: Chesapeake Black Voltage - Input Range (Volts): 12/24 V Gauge Size: 2" Box Set: No Box Dimensions: 4"H x 4"W x 5"L WT: 0.3 lbs UPC: 759266137011 Quick Guide (pdf)