I have a Defi HUD with rev adapter. I have the speed signal wire already from the TEAS system. I just can't find the tach signal wire that comes from the computer.

Does anyone know where it is?

 

I need to know too. Apparently it's a big freaking mystery, because I don't see any real answers on the website, and to me, that just doesn't make sense. As basic as RPM is, it seems that there would be a signal line. After all, the tach must be getting a signal, because it surely seems to show the RPM when I drive mine

I need it (and now) so that I can complete the installation of a coolingmist smart methanol injection system.

I read something about a dongle labeled #3 in the emanage wiring harness with 2 yellow, 1 black, and 1 brown wire, and the brown being RPM, but it was not written with crystal clarity. It did not specify which harness (blue or ultimate). There is a tach adapter dongle you can buy from GReddy, but it said it was for the blue system. If I find out, I'll surely get back with you. Seems that the experienced rotary guys here would be able to pop that answer out without even thinking about it.

Please, let me know also if you get a really good answer.

 

i have a spare emanage harness laying around... if ya wana buy it