yeah i have my main power supply from my head light switch. but i found out that the switch that comes with the gauges has to be put on because of some type of diode or capacitor in thereRDS02Stang said:You should still be able to wire it into your headlight switch. Just meter out which wire is hot when lights are on and cold when lights are off (I still think its the Brown wire in the center of the harness on the back of the light dimmer switch).
The other (black wire) should be connected to a solid ground.
Of course - check your instructions on the wiring