Horizontal Panel Mount Volt Meter. 6-12 Volt Range, Battery Percent Of Charge Scale and Alternator Test Scale. Bad - Weak - Good. 4 Point Snap In Mount. 1/4" Spade Terminals. Circuit Board Installed. Can be used for older units as a universal replacement. Wiring: P1 -Common to breaker. P2 - To 6 Volt terminal on Switch. P3 - To 12 Volt terminal on Switch.