12 volt headlight switching source in cabin

[bryontro]

Picked up a glow shift gauge and it has a 12 volt source wire for when the headlights turn on to dim the gauge. Has anyone found one yet to tap into? I've found 12 volt constant and 12 volt ignition already.

Thanks.

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[bryontro]

I did enough 12 volt probing and didn't com up with a headlight switched source. Instead of digging deeper into the dash, I decided to test the gauge lighting prior to install to see what the difference was. There is not a lot of difference between full bright and dim. I decided to connect the 12 volt switched and dimmer trigger wires together so it will stay in dim mode.