Chesapeake Black 2" Hourmeter (Digital)Perimeter-lighted Black dial with stylish Blue and White graphics, polished stainless steel bezel, contoured White pointer and domed 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 back light 12 VDC negative ground Can be adapted for 24 VDC systems Operating Range - 0 to 10,000 Hours Factory P/N MH0239*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 Box Set: No Voltage - Input Range (Volts): 12/24 V Gauge Size: 2" Series: Chesapeake Black Box Dimensions: 4"H x 4"W x 5"L WT: 0.25 lbs UPC: 759266137158