Coral 2 Hourmeter (Digital)Perimeter-lighted Black dial with stylish White and Blue graphics, Black aluminum bezel with burnished leading edge, 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:Scratch Resistant LensBlack Aluminum BezelContoured White PointerFactory P/N MH0244*Sold as an Individual**Gauge Cover not Included