Chesapeake Black 2" Voltmeter (10-16 VDC)Perimeter-lighted Black dial with stylish Blue and White graphics, polished stainless steel bezel, contoured White pointer and domed glass lens.A voltmeter indicates the battery voltage and the general condition of the battery charging system. The meter requires no warm-up and indicates voltage changes instantly.2" - Hole Size: 2.0625" (53mm)Specifications:. Anti-scratch glass lens. Perimeter lighted back light. 12 VDC negative ground. Can be adapted for 24 VDC systems. Factory P/N VP9154*Sold as an Individual**Gauge Cover not Included