Barry,
Would send the diagrams but can't attach thme with this mail set-up. Did ask your question to another one good at using the Tweecer. He replied:
There are people who have setup EDIS on 89-93 EECs. The code even has provisions for it. To do so requires an EDIS8 ignition module which basically replaces the TFI module to control and fire the coil packs. A switch in the code has to be enabled to allow the computer to speak the "language" of the EDIS8 module instead of the TFI. Although I don't know anybody on the EEC Tuning forum that has successfully done this, only rumors of those who have.
I've never heard of anybody setting up a coil-on-plug setup since that is only feasible on OHC motors where the plug is down inside of a deep hole that the plug can fit in as well and be secured at both ends. Plugs cantilevered out on the side of the motor without support would not be the best idea. And even if you tried, I don't know of an EEC-IV solution to fire them.
I've been begging our resident BIN hacker to get to work breaking out a 97 Explorer V8 tune for us so that we'll have a 5.0L EEC-V true EDIS EEC as a tunable option. That also frees up the ability to use the cheaper Moates tuning chips and use the OBD-II port for datalogging instead of the TwEECer. But the cost of the high speed OBD-II datalogging hardware is right up there with the TwEECer in cost so there's little benefit cost-wise. It would just be nice to have the Explorer EECs as options. The next-best option is the 96 Mustang EEC which has a fair amount of support, but not nearly the polish and completeness that the 89-95 Mustang EECs have.
Dave (white to white, black to black and green can go anywhere, that's my wiring ability) Good luck!