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Tachometer
Thank you all for your replies.
For your information I found a shop that will overhaul the tachometer instrument itself - normall $300 - $400 and will check it out first (see below.) BUT he says 99% of the time it is either the clearance setting on the tach points in the mag or the wiring connectors. We are going back and check this out on my rear mag (easy to get to) first before shipping the instrument off.
The shop is Rudy's Instruments in Rudy, AR (just north of Ft. Smith and not on the airport) 479-474-8759. Very nice person and seems knowledgeable on this instrument. Good information to have.
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