My previous M4 install one of the Aux outputs was configured for Tacho and this worked fine, driving the tacho on a BMW E30 M3 1990.
I have recently installed M800 and with the Aux 3 configured as tacho, I have no tacho!
Questions...
1, Is there any difference in the M4 tacho and M800 tacho signals?
2, What type of signal does the M800 output for tacho, i.e wave length, polarity ect?
3, Is there anything specific I need to do to drive such a tacho?
Thanks
Steve