All M340 cars come with a smaller tach in heads up display.
If you change your cluster to M cluster (looks like the one on M8 or M5) then the standard tachometer goes away which is sad.
I had it coded remotely using E sys so I don't know what exactly they changed.
However, having the M tach activated on HUD somehow interferes with assisted driving functions. Somehow car thinks that you're in an aggressive driving mode and turns off your cruise control functions. This is an issue and I went back to having my cruise controls work.
We are trying to figure out a work around this issue
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