Euro White 2 Cylinder Head Temperature Gauge (60 - 220Adeg F)Perimeter-lighted White dial with bold Black graphics, Black aluminum bezel, contoured White pointer and flat 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 White dial12 VDC negative groundCan be adapted for 24 VDC systemsDual Scale - Metric and ImperialFactory P/N GP9439*Sold as an Individual**Gauge Cover not Included