Im am trying to wire in some lights for under my dash on a 96 5.8 f150, and would like to tie it in with my dash lights so it dims. where is the best place to do this and which wire is power? I was thinking a power wire for a bulb on my ac contols, took it apart and found that there are more than expected wires hookedup to it. And also where is the best place to ground the lights back there. Thanks, Im trying to get this done before dark.