> Andrew wrote:
> My W123 tach is also going wacky - acts the same even when
> I swap the under-hood sensor.  Oscillates, goes to zero,
> generally misbehaves.  Used to work great so I am thinking
> it has to be the sensor and NOT the PU unit that screws
> into the tach chassis housing.  Maybe I should just swap
> out the cluster gauge for one of my many spare used units?

"used to work great" doesn't exonerate any of the components.

Just a reminder, the tachometer system on a '85 is different
than all the other years of W123s.


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