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Jerry,
Very seldom... I mean to say V-E-R-Y SELDOM does a problem involve the indicator instrument itself, unless something has shorted out internally, and it just doesn't happen. Given the number of years your tachometer indicator has worked without a problem, the FIRST SUSPECT would point to external wiring as we've already discussed and/or the extra set of mag points themselves. I do hope you have a Cessna Service Manual with the details as to the inspection and adjustment of the points, or you'll be shooting in the dark. My bet is that you've either got misadjusted points... or more likely, intermittant connectors at the pigtails which are located about 5 to 7 inches from where the leads comeout of the magnetos.
Let us know what you and your A&P find.
PS... Exhaust everything with the wiring and points BEFORE doing anything with the instrument itself.
SkyKing
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