coding plug question 5k vs 7k

[jayuuey]

First off, apologies for another coding plug question. I've searched but there are so many different posts with conflicting info.

For later style clusters VDO/Motometer, does the coding plug differentiate m20 ETA (5k redline) vs I (7k redline) or is it irrelevant since they are both 6 cylinders?

My 87 eta cluster began acting up again so i swapped in a working 88 325i cluster (no coding plug or tach changes just a direct remove/replace). The cluster appears to be working but at 5k rpm, it seems like it wants to rev some more.

Thanks.

[MR 325]

Yes the Eta and i coding plugs are different.

[jayuuey]

Do you only swap plugs if you swap tachs? Or do I need the eta plug on my 7k 325i tach?



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[AndrewBird]

Pretty sure the coding plug needs to match the tach.

[jayuuey]

Ok so i can keep my set the way it is now, which is 325e with a 325i tac and coding plug.

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[MR 325]

Pretty sure the coding plug needs to match the tach.

Exactly.