Chesapeake White SS 2 Cylinder Head Temperature Gauge (60-220AdegF)Perimeter-lighted White dial with stylish Blue and White graphics, polished stainless steel bezel, contoured White pointer and domed glass lens. A temperature gauge operates by sending a low amperage current through the gauge's meter to the ground via a sending unit with variable resistance. The resistance of the sending units increases or decreases with the changes in pressure, temperature, etc. 2 - Hole Size: 2.0625 (53mm)Specifications:Anti-scratch glass lensPerimeter lighted back light12 VDC negative groundCan be adapted for 24 VDC systemsDual Scale - Imperial or Metric Factory P/N GP9454*Sold as an Individual**Gauge Cover not Included