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Bouncing tach

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Joined
Jan 24, 2021
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Just got the 180 back from annual. The first since we got it. Cabin air box needed to be rebuilt, luckily I'm a fabricator and put that in the owner produced parts category. Other than that everything looked good except for brakes needing re-sealing. Big sigh of relief on my end. First flight back and the tach started to bounce pretty good, about 200 rpm. Tried lubing the linkage but didn't do anything. So what would you go after? Tach or cable? Or both?
 

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