Tach problems

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Tach problems

Post  pigs521bbf on May 27th 2014, 9:40 am

I have a sunpro tach, when the engine is running, the tach needle keeps going up and down. Not sure why.. I have Mallory ignition box and ignition panel with push start.. Any thoughts?

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Re: Tach problems

Post  69F100 on May 27th 2014, 10:07 am

My old Mallory Tach in my 69 it was loosing ground and the needle was jumping around would not do it until I got over 2000 rpm  I started checking all the connections when I found my problem check all your connections if everything good it more than likely the tach.
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