Marcus,
I am working to build an OBD II harness and all the components necessary for the 97-upgrade. I am having a fun time doing the wiring right now! It will probably be a little cheaper than the FAST system but, not much. If I can find a cheap source for the harnesses it would help greatly! I had to buy new Ford harnesses for the one I have for my S351. We won't discuss how much that was. I bought bumper to bumper, all the harnesses! I need to find 96-up 4.6 gt harnesses and 94-5 injector harnesses.
Scott