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post #1 of Old 09-07-2013 Thread Starter
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bouncing tach

I have a Perkins motor on my Morgan and a year ago it started bouncing and I know it is not accurate any more. I checked connections at the back and all seems well. What could this be due to? The gauge reads then drops for a split second part way down but there is no audible change in motor rpms. This happens frequently but not constantly. Do I just replacethe ggauge or is it more involved?
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