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· Tartan 27' owner
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Yup.
Look for a wire coming off your alternator that runs to the tachometer.
This wire is likely not very well connected - electrically or mechanically.
The alternator provides the engine rpm information to the guage.
Have seen this before on a friends universal diesel.
When the wire is disconnected the tach seems dead. Could also be a short along that wire.
 
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