You have to remove the GPS signal to the head unit and fool the unit into thinking that the parking brake is set. I'm sure you can find the GPS wire and put a switch on it. At that point, you may be able to set one click on the parking brake and have it work. However, the Lockpick is a cleaner, reversible, albeit, more expensive solution. The Lockpick will also allow you to add additional cameras and you can use your cameras while in motion.