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 lens Perimeter-lighted White dial 12 VDC negative ground Can be adapted for 24 VDC systems Dual Scale - Metric and Imperial Factory P/N GP9439*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.