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. - cis2:mm5mnJlm -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;