Chesapeake Black SS 2" Ammeter Gauge - -60 to +60 AMPSPerimeter-lighted Black dial with stylish Blue and White graphics, polished stainless steel bezel, contoured white pointer and domed glass lens.An ammeter indicates the current flow through the battery charging system. A "zero center" ammeter, during chargine, shows a (+) positive reading indicating the current is flowing to the battery (charge). A (-) negative reading indicates current flowing away from the battery (discharge).2" - Hole Size: 2.0625" (53mm)Specifications:Anti-scratch glass lens12 VDC negative groundCan be adapted for 24 VDC systemsFactory P/N AP9530