If you are having your turbo overhauled anyways,
consider having flats milled on the shaft at it's
mid-section.  Machine the center casting to accept an
inductive prox sensor that senses the flats as the
pass the shaft.  Now you've got a rugged, reliable
method of measuring shaft speed.  This is the method
Allied Signal used when we requested instrumented
turbos for test purposes.

Roger Enns.


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