You want to tap into the gray plug on the top of the lighter. This provides power only when the lights are on. I would use some "quick tap" crimps to tap into the wires. I can't remember the colors though, but if you post the colors I might remember which one is positive. I wish I saw this post eariler because I spent hafe the day with the dash torn apart putting in a Profec B.
good luck.
good luck.