One of the wires to any of the coils. Just pull the rubber boot back and try each wire till one gives you a signal. When I had my car dynoed; they run it up through 4th gear, turn the car off, restart it, and continue to do the pull in 5th. Not sure if that's the exact sequence you're supposed to do, but it works.
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CURRENT ll F10 M5 l E85 Z4MR l I01 i3 REX
SOLD ll E70 X5M l E85 Z4MR VF570 l E36/7 Z3MR l E36 328i
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