The instructions were useless. We got one for a customer and could not make heads or tails; did finally get it to work with a little help from a friend. It also uses a cheesy looking duplicate defroster switch, and the customer ended up ordering a new wood panel for his center console to avoid the drilling/cutting. If it were my car, I'd spend the money on something else anyway. Didn't impress me. The RennTech swaybar or first gear start would do you much more good, and the swaybar costs about the same. Hope this helps.