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Yup for me it was

Yup mine did the same thing take a look at where the cable goes into the back of the tach I'm willing to bet its oval and not square anymore

I'd take the tach out and have a real good look at the back where the tach cable goes in. Mine died on me but would work on a drill seems the drill didn't turn it with a enough torque to make it slip inside the gear on the tach