MSefi.com read only forum (Jan.15,2018)

Hello everybody, I am a bit confused about the tacho pin #36 of the DB 37 I think. Is this how to trigger the coil? Also, The tachometer that I have used to be controlled by the stock ecu, how do I send it a signal form the Megasquirt (V2 3.0)?

Thanks so much! - Chris Fowler

Tach signal MS wise usually refers to the RPM signal from engine to MS. Pin36 is that tach *input* to MS.

To derive a suitable signal to drive your tachometer, check the manual for how to.

Pin 24 is the tach input; pin 36 is a spark output. Did the factory tach run off the coil or off a 0-12 volt signal?

I have the same problem running wasted spark. The stock tachometer is originally connected to coil +12V, using signal from one channel would make tachometer show 500 rpm at 1000.