2940 tach intermittent

BaggyPiper

New User
I know the electric tachs have been discussed a lot but I'm trying to figure out something based on symptoms...

When I bought the tractor last winter, the tach only seemed to work after the engine warmed up.

I replaced the tach sensor @ front of the engine with a new one, but no change--still only seems to work after the tractor warms up.

What could likely be affected by the tractor warming up? How can I test what's going on?
 
Typically, solder joints crack in the PC board in the instrument cluster, and it gets "flaky" or thermally intermittent.
 

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