Euro Black 2" Oil Pressure Gauge - Metric (5 Bar)Perimeter-lighted Black dial with bold White graphics, Black aluminum bezel, contoured White pointer and flat glass lens.A pressure 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 change in pressure.2" - Hole size: 2.0625" (53mm)Specifications: Anti-scratch glass lens 12 VDC negative ground Can be adapted for 24 VDC systems Dual Scale - Imperial or Metric Factory P/N GP9511*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: Voltage - Input Range (Volts): 12/24 V Series: Euro Black Gauge Type: Oil Pressure Gauge Size: 2" Box Set: No Box Dimensions: 4"H x 4"W x 4"L WT: 0.3 lbs UPC: 759266128057