Ed, I bought one for my 2005 Ram 2500 with Tow Pack, it simply plugged right in to the factory wiring, and two screws attach it to lower left of dashboard ( could have used velcro, I suppose ). I'm at work, and don't remember its name, but it was the one that was suggested by 3 different large RV places I called. I'll check when I get home, and will post later tonight.
Mark
