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Hi JohnRedman,
The 91 won't have a tach amp in the same sense as the OM617A engine'd cars did.
In the 91, you have the OM603. I believe the tachometer is run by the EDS computer.
More than likely your tachometer gauge is the problem.
In my experience the gauge in the cluster is at fault. The only exception is the OM617A equipped cars that have the cylindrical tach amp.
I service instrument clusters, if you are interested, I'd be happy to help out. Just drop me an email or PM.
--Kris
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