I have the Pingel electric shifter. Just got it to work, they have a second edition of the kill box now. They did there proto-types on an '03 and for some reason the '02 didn't like it. They made a change and works like a champ now. Anyway... to answer your question.
The pingel has two boxes with it. One, the control box that is the electronics for the shifter. Box two is the kill box for the ignition, it has an adjustable timed output. Box two has two connections one with three wires from the control box, +, -, and shift signal. The other is brown wire that you wire to the (-) of the coil, comes from ECM. From what I have figured out, the ECM sends a (-) signal when it needs to fire the coil, the kill box in turn places a timed (90 to 160ms) positive signal on the negative side which doesn't allow it to fire. Mine is adjust to the minimum (90ms) which is all it needs to unload the pressure in the trans and the electro magnet fires and your shifted smooth as silk even at full throtle. I could not believe how smooth, and fast, there is absolutely no way that you could shift faster. BTW if you get one and you blow your ECM fuse, turn down the adjustment (counter clockwise). To long of a (+) on that side of the ECM draws high current and blows your fuse. I am sure once I go to NOS it will have to be adjusted for the extra power.