Originally Posted by EagleMark
You can use the harness that came on the truck and save big bucks. Don't need the fuse block but some are underhood and very handy. Most of these harness are installed on engine and trans before they are installed so they come out easy, just a few extra wires need to be cut or relocated. Yes you do need the OBDII connector or you'll never be able to read codes or re-flash the PCM.
Old thread, the guy never responded which usually means he never did it.