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Old 05-28-2002, 10:23 AM
Registered User
Join Date: Apr 2001
Posts: 167
Why would this happen?

Why would the tach stopp working on a '87 300 TD?
The needle is sitting on the bottom peg.
Doesn't move.
Thanks in advance.

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Old 05-28-2002, 11:13 AM
Registered User
Join Date: Sep 2001
Location: central Texas
Posts: 17,277
I think most of these Tachs are mechanically driven... find a book which shows how to take the cable out of one end or the other, whichever is proper... and see if it has broken...
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Old 05-28-2002, 03:00 PM
Swedish Diesler
Join Date: Jan 2002
Location: Sweden
Posts: 106
It is electric and common cause seems to be that the tach looses it's grounding.
Solved by rerouting a ground wire on the back of the instrument cluster.

Does your AC work ok? If it does the sending unit on the engine is ok. If it also has failed the sender or it's cabling might be faulty.


MB E300TDT -98
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