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I installed voltmeter. Instead of tapping the ignition wire like DanG did (because I just have a thing against cutting/tapping my ignition wire) I used a fuse-tap to the instrument cluster fuse in the fuse box. On the back of the gauge, there are 3 poles, and 2 wires for the bulb. To make my gauges quik-disconnect if I need to remove them, I used butt connectors. I tied the ground wire from the lamp and a ground wire to the ground pole together to one connector, put a connector on the positive lamp lead, and put a wire and connector on the positive lead for the voltmeter. I ran the wire I fuse-tapped to the voltmeter's positive lead, ran a wire from the dimmer switch to the lamp positive lead, and grounded the whole thing on one of the huge torx-head bolts in the door frame area.. There should be instructions in the gauge packaging...
