sounds to me like you have a loose connection somewhere, i installed mine no problem, but then it didnt work right away, i read it agian and found my mistake, it works perfect now, but mine is a 96 and i dont have the HEC module like you do, but it still reads a digital signal. the things i can think of are in the first place, ditch those crappy connections (scotchlocks) and solder your wires in-line, and second, make sure all your switches are set in the correct position, otherwise, you encounter what you have now.... 
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96 GT 5 speed, bassani x pipe, mac catback, k&n air filter, motorsport wires, 3.73 motorsport gears (love em), 2000 PI heads, intake combo, speedo calibrator...
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