Euro White 2" Hourmeter (Digital)Perimeter-lighted White dial with bold Black graphics, Black aluminum bezel, contoured White pointer and flat glass lens. Hourmeter operates by applying battery voltage across the gauge&';s register motor to ground. The register increments increase when the key switch in on. Route power through a normally open Oil Pressure switch to count "engine running" hours.2" - Hole size: 2.0625" (53mm)Specifications: Anti-scratch glass lens Perimeter-lighted White dial 12 VDC negative ground Can be adapted for 24 VDC systems 10,000 Hour Scale Factory P/N MH0243*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: Hourmeter Series: Euro White Voltage - Input Range (Volts): 12/24 V Gauge Size: 2" Box Set: No Box Dimensions: 4"H x 5"W x 5"L WT: 0.3 lbs UPC: 759266129139