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I picked up a circuit tester that also checks RPM for $35 at Autozone. Good place to start before you jump to buying a new one. I needed to verify the signal coming into the tach was correct. Mine is but the tach is jumping all over the place. Next you need to make sure you've got a good ground. If you do and the feed from the coil/MSD box are good - you probably need a new tach.
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