First you can not simply change both clusters with an ECU immo'ed OFF, you will need to match it. do you have the code of the old and new clusters? also the code of the ECU will be useful too? did you test speedometer in car moving? Basically all IMMO 3 cluster uses W/K-lines + CAN communication. I am not sure if your old IMMO 2 cluster and M38x ECU has CAN buses to share car speed and compute fuel consumption.
I have changed mine too but my ECU is an M383 CAN capable that uses an old IMMO3 old cluster too, then swap and match was not too complicated.
I hv both skc on both clusters
But i do not need to match the old skc to the new one.
The new can use, the speed, rpm temperature are well, only the data(fuel consumption) can not show.
Mine car is m3.8.3 too
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