We just got back from our eclipse trip. We went from Atlanta to Cumberland
Mountain State Park near Crossville, Tn., about 170 miles away.
Surprisingly, there is only one item on my post-trip punch list.

At times on the trip I'd look at the tachometer and it would be reading
zero. All other instruments were OK. I'd look at it again later and it
would read normally. One time I saw it suddenly jump from zero to the
correct RPM. My first guess is that the connection at the coil was loose or
corroded. I looked at all the connections (I don't know which one is for
the coil) and they were tight. I cleaned them all anyway and bent some a
little that looked like they could be tighter.

I may not notice the tach just driving around town and would rather not
wait until we go on another long trip to  see if I fixed the problem. Is
there something else I could look at?

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