Get the book: how to inderstand, service, and modify Ford fuel injection& electronic ignition controls. Its a little daunting at first glance, but once you study the book a little and with the help of the diagrams it'll ease out on the complexity. I took a brand new harness and dont see any point in sending it to someone to modify. Do it yourself so you can learn how it works and you'll find its not all that bad. going to have to upgrade your alternator and do an egr and canister purge elimator kit which you can find online or try ron morris performance....