I have an 07 yukon denali with a bose system with no dvd player and a 6 disc cd changer deck. I would like to put navigation and flip down monitor in the back. I want to use the Pioneer AVIC X940BT unit and keep all the factory options ( bose, onstar, bells and chimes, steering wheel controls i phone and what ever else there is) I dont know what wireing harness i need and would like your guys recomendations. thanks for the help.