I've got an S4 FC and an Elite 1500.
I've followed the instructions on this thread .. https://www.rx7club.com/haltech-foru...-tacho-829607/
but still unable to get the tach working.

I'm using the purple/black wire (dpo1) and have tried wiring to the yellow/blue wire in the stock harness(there actually seem to be 3 yellow/blue wires in the 2 harness plugs-tried all of them).

What am I missing? If nothing, I'm running igbt coils instead of stock. Is there a way to wire the tach directly to the igbt coils?

 

Your best bet is to wire in to FME-01 or directly to the ME harness. There should be only one Yellow/Blue wire, top row 3 in.

 

For some reason that didn't work.
I spliced into the signal wire of the leading igbt coil and wired that to the yellow/blue wire with the bullet connector that's in the harness of wires by the rear coils.

 

on the elite my setting for the output pulse was different to the E8. have you set it up on the ECU side? or its not moving at all? Dash got power?

 

there should be one wire with a bullet connector where the Trailing coil was installed.
Hook your purple to that.

 

Y, I wired the purple/black wire to that yellow/blue connector-the one with the bullet connector. That worked.

 

That should actually be the same signal/output as the wire I suggested. If everything is working as it should great, but you may have something tweaked/broken upstream that may cause problems in the future if you're trying to tap into any of the FME/X connectors in the future. Just a heads up.

 

What are your software settings? Pull up set to 12v, 2 pulse?