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I had this exact issue . I had it serviced and was told that the Jewel movement needed lubrication.

I also had it re calibrated at that time and was told that it was off several hundred rpms.

Even though the tach case is sealed air tight, after 50 years there was enough magnetic dust accumulation on the movement to effect the needles action.

PM me here if you need a recommendation for the repair.

Last edited by panteradoug

Removing the tach isn't much fun.  I would recommend laying in the floor and trying to check the wires before you remove it.

The ground wire came loose on mine and is highlighted in red in the picture.

If you have to remove it there is a U-shaped  bracket that has two nuts on it to hold the tach in place against the back of the dash.


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