Just linking old thread and giving it a title that I can more easily search for and find!

Bit cold here to do the troubleshooting, even in garage! Maybe in Spring. Tach is not that useful anyway.

Previous thread with some good info on how tach and egr are related:

http://www.peachparts.com/shopforum/diesel-discussion/326229-egr-gizmos-do-i-need-them.html

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5