Wiring in a tach to the Chevy ign. Module
mylittlecj5
RIP Mike, we'll all miss you
Anyone know where to tie in a SUN tach to the Chevy HEI module I have installed in the Jeep? 
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Wiring in a tach to the Chevy ign. Module
- Thread starter mylittlecj5
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BusaDave9
Always Off-Roading Jeeper
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You should find a wire on the distributor that is marked "TAC" or "TACH". That's where you will get the signal.
Cheepjeep85
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he has the tfi using an hei ign mod same as mine. you don't tie it into the ign mod itself, you use the ground side of the coil.
mylittlecj5
RIP Mike, we'll all miss you
ground side of the coil, thanks. can i tap into the twisted pair near the module, or would it be better to take a seperate wire right to the coil?
busadave, thanks
but I dont have the hei dizzy, just the module under the dash. Its a little bit of everything lol
Old Dog
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If it were me I'd go straight to the - side of the coil.
Cheepjeep85
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you can tap it thats what i did. but it doesn't really matter if it makes you feel better connect it separate