if you have an aftermarket stereo in your car the aftermarket plug wire color is LightBlue/Red. if you have the stock wiring just tap into that wire. its the dimmer wire for the lights on the radio.
red wire......I went to a switched power in fusebox
green wire..... to green with yellow on the coil harness
white wire.....dimmer switch in fusebox (I used the fog light fuse but the tach light will go out when you hit the high beams)