hey guys im going to attempt to wire in my expo visors but ive got a few questions. i know i have to tape into my map light power but which one is it? also does anyone know what gauge it is so i can get the right tap connectors. any tips on grounding would be much appreciated. im thinking ill just wrap a wire around the spring and then put a ring terminal and put a washer on bottom and top then put the screw in. i really dont want to put a hole in my roof.