Dress White 2" Hourmeter (Digital) Perimeter-lighted White dial with bold black graphics, white aluminum bezel, contoured black 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 12 VDC negative ground Can be adapted for 24 VDC systems Scale - 0 to 10000 Hours Factory P/N MH0240*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: Dress White Box Dimensions: 4"H x 5"W x 5"L WT: 0.3 lbs UPC: 759266131309