Successfully installed the Gentex 26 A last night (Onstar, Auto Dim, Temp, Compass, Reverse turn off). I mapped out the pinouts for this conversion if anyone is interested. Does anyone know where to pick up some extra square wire harness pins that come in the stock harness? I need a few to begin working on my map/dome light mod. BTW - for those of you who did this, where did you end up putting the Blue/white wire? Thanks!