12v Power Source

[gqneon]

I'm planning to try installing a couple mechanical gauges in place of the factory ones in the center dash area above the touchscreen. Is there anywhere convenient to source 12v power that only comes on when the headlights are on? Or someplace not convenient, even? I want the gauge lighting to come and go with the rest of the dash lights.


I looked at the plug that plugs into the back of the two stock gauges but can't find a wiring diagram for it to know what's in there and when it's hot or not. I was leery about putting a voltmeter to it before knowing what I had in my hands.


Any experience in running down a 12v lead and ground that would work when the lights are on?


Thanks!