Beautiful BMW E30 M3 S54 swap. The problem is that there is no OEM coding plug option for 6 cylinder engine and 9k tachometer. The solution is to use custom coding plug board:
[ Ссылка ]
You just need to have any coding plug, open it, swap the old board with the custom one and install it back to the cluster.
There are also available custom boards for another not OEM configurations as well.
