Supra NA to Coil swap Tach question

[ihiryu]

So a few guys are using NA-T builds and have gone over to coils (which I have done as well for a customer), but now I have no tach output.

Doing some digging and I came across this:

http://www.supraforums.com/forum/showth ... pras-w-aem

So I haven't pulled the tachometer just yet, but I have went from Aux 4 to Pin 29, and I still get no tach reading. Is there something I'm missing or should I go ahead and just pull the tacho?

[WHPZach]

You'll probably need to pull the tach and make the modification. I don't know off the top of my head what kind of signal the GE ignitor output, but I do know there's a difference between the NA and TT tachs. The only way to know would've been to scope the signal before you removed the GE ignitor, but it's too late for that.

[ihiryu]

Yeah you have to do it, just got done wiring it up, and it all works now.