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I do have 12V DC into the tach. Someone told me that I need to check the signal wire into the tach for AC voltage. It could have up to 90V AC on it. That will confirm if I have signal to drive the tach. And if I do have AC voltage present, the tach is the problem.
Can any of the much more experienced people here confirm this?
No way. If this is the original, unmodified tach, then it works by measuring the AC current, not voltage. It is only if the tach has been converted to modern voltage-pulse system (which requires some rewiring) that you will be able to measure a voltage signal.