Would someone have a pic or explanation of how the wiring harness (PAC in my case) connects to the Z3 harness. I am new to the installation game. The diagram for the PAC harness tells me to cut off the RCA connectors on both harnesses and then join. My car as no bose/onstar.

 

I pretty much have everything else figured I think, the VSS, ebrake bypass, the reverse signal.

 

Thanks for any feedback