The 4.0 harness requires you to remove all the 2.5 stuff. To run the new wires you pull the 5 & 6 injector connector with wires from the pcm connector bulkhead on the 4.0 harness. The pcm is only a ground so you get your power from the main line. I think the main power line is green and black and all the other injector wires attach to it. So put your new connectors where you want them, push the wiring into the heat wrap all the way to the pcm. I can get you the diagram of the bulkhead to see what numbers you push your pins into. Push your pins into the corresponding holes, then tap your power wires into the main injector feed wires. Install your new pcm and connect the bulkhead and you are good to go. I'll try to find that pinout diagram so you know where to put the new wires. If you don't understand (or if I'm confusing you) I can take some pictures of mine.