I'm creating a remote diagnostic plug to be able to use my OTC 4000 without having to run the communication cable outside the car. (Presently I run it out the passenger window through the hood vent on my Charger.) I have a spare diagnostic plug to which I am going to attach extensions to feed through the fire wall to the existing plug in the engine compartment. My question is, will I have to hook up all of the wires or can I just use the xmit and receive wires and the power wires.