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Off the top of my head, my 95 dsm coil pack is plugged into the 95 dsm igniter and the tach wire on the igniter is running to the previous tach wire off the distributor, which runs back to the ecu tach input.
From what I read I need 2 different signals for the 95 dsm ecu and factory summit tach to work?
One wire back to the ecu tach input and a separate tach signal to the tachometer for my 95 dsm ecu and tachometer both to work?
The tach wire at the ignitor should then be putting out 2 pulses per engine rev, it basically combines the pulses from each coil, and returns it to the ECU on the tach output from the ignitor.
I would guess that a distributor tach output would also be 2 pulses per engine rev, because that is very common for 4 cyl tachs. Where did you read that you needed 2 different signals, and did they say why?