the problem with these on/off switch's, once they hop in and relize there is no power to anything, its obvious theres a main power cut off and if they see the big red nob sticking out...its all over
I just purchased one of these at napa yesterday. The guy that worked there helped me out quite a bit since he was in the repo business also lol 
anyway its pretty simple just run this in line with your battery. Im putting this in my cab under the seat. That seems like the best spot for it; and if someone were to see it they probably won't know/care what it is. All you would see is the little stem sticking out of the carpet.
