have no clue about the factory wire diagram. need help on finding the speed wire and the reverse light and park brake wire. also how do do the bypass on the z2 so you can watch a dvd while driving. hopefully someone can help thanks

Bypass info is in the sticky at the top of the hacks/mods section

parking brake is light blue at the parking brake, or in the bcm in a brown plug

speed sense is dark green/white at the radio harness, c4 orange conn., pin 5

reverse light (you don't need unless you have a back up cam) light green at fuse box under hood, c3 plug pin e4

this is for an 07 Sierra new body style 1500, hope this helps.