Tach problem

Can someone tell me what is up with my tach? I just installed a new cable, and 
it worked fine for a few days. But now it just sits at zero at idle, then 
slowly, over the course of 20 or 30 minutes, it will creep up to 5 or 6 
thousand and stick. If I disconnect the cable it will drop to zero again. What 
is going on?

Thanks!

Joe Lansing

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