Ok, You have 2 wires right? The power and the ground. You'll want to hook the power into a hot wire that comes on with the headlights. And the ground you can screw into something metal (Just find a screw under the dash and take it out then hook the ground into that and put the screw back). As for the power, theres a light in the cubby hold that is triggered with the headlights. Splice into that one. The gray one is the wire you want to tap into. Reason I recommended this wire is because its 12volts, just like your gauges.
Once you splice it and make sure everything works, cover up the thing with some solder or some eletrical tape.
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