I swapped out motors from tpi to carb and now my tach does not work. I have a new msd hei distributor and plugged the white wire that was on the tpi coil into the slot on the hei Distributor labeled for tach. This is a 1990 camaro if that makes any difference. Thanks for any input.

 

What's the distributor P/N?

 

part #8362

 

i would like to know this also, i have same problem, do the factory tach hook up like a aftermarket?

 

As far as I know you plug the white wire into the distributor where its marked tach. BUT this will not work on my 90 Iroc, something must have ran thru the comp, and I deleted it. Maybe someone will chime in with the answer.

 

Tacho feed goes direct from coil or HEI to tacho.
White wire off coil to Instrument cluster in diagram
see
http://www.austinthirdgen.org/mkport...ine_wiring.gif

Maybe you screwed up when removing computer wiring.
Find the tacho signal wire ( white ) at the dash plug and meter between that and the connector at HEI to see if you have a circuit.
If not you have a break in the wire somewhere

 

Thanks Vette I will ohm that out tomorrow, If that schematic came from the service manual what page is it?

 

Someone has scanned all the engine pages and put them online
Should be in the circuit diagrams of your FSM