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Well EDIS is used for Ford setups that don't use distributors. I swapped to a coil-on-plug system for my KLZE build as the stock system had a tendency to overheat and fry itself, so I had to use bits out of the Ford parts bin to make it work.
Running fuel off the tach signal is a result of the above set up (no disty). Otherwise you'd run it off the current pulse from the disty rotor.
Edit: I would recommend picking up an extra CPU or two for your board. While it's not a common occurrence, you can occasionally accidentally fry your CPU during a bad data download, especially if your computer crashes. I always kept a spare with a decent tune on it (one that would allow me to drive home, though not with any major boosting,) and it came in handy after a bad download fried the chip. They're only $30 or so, and it's good insurance to have when you're on a drive.
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