I have a coding plug in perfect condition from a 1992 325ic that I ran in my M42 cluster for a while after the 24V swap, but now I've switched to an "i" cluster. This is the coding plug you need to get correct RPM reading on your tachometer after doing a 6-cylinder swap (M20/M5X/S5X).
EDIT: price lowered to $20 shipped.
Note: the cluster itself is not for sale (keeping it around for parts).
Pic:
EDIT: price lowered to $20 shipped.
Note: the cluster itself is not for sale (keeping it around for parts).
Pic:



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