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Yea 3 wire that big ass fourth terminal brings the lightning to the thunder dome thanks this helps alot3-terminal connector? Best I can tell:
A = power from ECM1 fuse via pink wire.
B = signal to Tach via white wire = tach
C = Grounded by ignition module to create magnetic field
"B" and "C" are electrically identical.
I'm sure you can figure out the bigass fourth terminal on your own.