Coral 2' Oil Pressure Gauge (80 PSI) Perimeter-lighted Black dial with stylish White and Blue graphics, Black aluminum bezel with burnished leading edge, contoured White pointer, and flat 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: * Scratch Resistant Lens * Black Aluminum Bezel * Contoured White Pointer * Dual Scale - Imperial and Metric Factory P/N GP9527 *Sold as an Individual **Gauge Cover not Included