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I have installed a new OEM wire harness; have most things working now, but TAC is inop?! On a 4spd car with all the TSC hookups, does one of them complete the TAC signal? I installed a 700r4; none of the TCS related wires are in use.
 

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On my 4 spd 70, the tachometer signal comes off of the coil, don't remember which one for sure but I think it is a white or yellow wire off of the negative coil post. I'll have to look when I get home tonight.
 

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tach wire is brown, there should be a hole by the gas pedal cable that the wire goes thru to - side of coil
I stand corrected, brown it is. I now have an MSD unit on my car, that's where I got the white wire from. However, original equipment is brown and goes to the negative coil as stated.
 
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