Tim Hunsinger

Just did the tpi to carb swap...how do I get the tachometer to work? I think it used to read from the ignition module but I'm not sure. The HEI distributor I am using now has a terminal marked "tach" but I don't know where to connect it to and if it will not harm the tach. Thanks in advance (no pun intended).

b92z28

on your old coil harness there was a pink and a white wire going to the coil. the white wire is the tach. hook the white wire to the tach lead on your hei.

stryduh

is the wire that is also in the old harness the + wire for the distrib?

Tim Hunsinger

Yes, that worked (the white wire) and the big pink one is going to the + terminal on the HEI distributor. thanks.

stryduh

So the pink wire is the + for the distributor? I tried checking power at it and get nothing?

Tim Hunsinger

The pink wire on my car is hot when the ignition is on and dead with ignition off. My computer is still in the car if that has anything to do with it?
Oh yea, I like the carb better than the injection.

Bobbyz

iTrader: (1)

tim just wondering i just went from tpi to carb set up on my 85 z28 i am going nuts on the wiring under the hood i lost track of wires and stuff i have the starter hooked up the alt and the dist. i beleive ther are right lol when i turn the key i get nothing when i jump the starter she cranks just wondering how you did your set up and what was needed and not and the computer is still connected can that be a problem too

Wickydooda

iTrader: (1)

On my TPI 89 Firebird Formula, the ECU will still control the fuel pump, so removing the ECU would disable fuel. I left the ECU in and now its sole purpose is to provide VATS security and control the fuel pump.