That is really interesting. Let me just add some more complexity to the whole loop.
1st I am not using the original Motronic from the AEB rather than a really custom build ECU using Mega CPU.
The signal for the RPMs comes directly from the ECU where you can configure it to match either 4 cyl or 6 cyl. Apparently it doesn't suit me hence I get the wrong threshold.
As I mentioned before, the whole cluster (dash) is from ACE 2.0 Compettiotn so it should work properly logically, but that is not the case.
So in this case, the cable that comes out of my ECU should be connected directly to pin 2 on the OPM relay ?
1st I am not using the original Motronic from the AEB rather than a really custom build ECU using Mega CPU.
The signal for the RPMs comes directly from the ECU where you can configure it to match either 4 cyl or 6 cyl. Apparently it doesn't suit me hence I get the wrong threshold.
As I mentioned before, the whole cluster (dash) is from ACE 2.0 Compettiotn so it should work properly logically, but that is not the case.
You need to connect this white/grey wire from F1 onto pin 2 (two) on the OPM relay - the 4-cyl version so that rpm scale is correct (otherwise will be 20% or 25% wrong rpm threshold).

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