The best way to run your power wire is going to be through an exisiting rubber gromet. Just open up the gromet, and stick your power wire through, and proceed to run it. Be sure to keep in mind that you need to run your power wire, and RCA's on seperate sides of the car to avoid noise interferance. As far as grounding the amp goes, you can ground it to the bolts in the back seat, or just find a place in the trunk, sand of the paint (so you get good ground connectivity) and secure it with self tapping metal screws. I'd give you exact locations, but I don't own a teg. Good luck man! Out of curiousity, what items are you installing?