gps in 06 08 f 150 fx4

Im doing a side job for my bosses son. He bought a ton of car audio stuff and Im installing it. the only issuse i have is the GPS is asking to be tapped into the Reverse gear switch and Drive speed gear signal. where can I find these wires in the cab and what colours are they? I was hoping my work would have the diagrams on records because we build/install all types on lights in government vehicles and ive worked on countless f-150 sadly ford only gives us the needed colour codes .

dark GREEN/ YELLOW for reverse.. right pillar if vehicle has electrochromatic rear view mirror, left a-pillar/underdash if it has parking aid. grey/black for vss at radio. and the wiring is the same for '06 and '08 models since you didn't specify