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Problem solved, you were correct, rotating the selector screw on the back of each tach solved the problem, at least the tachs look like there working correctly now. I returned the screws back to where they were, it looked like the number 12 but it was hard to read. The next number was 6, I was thinking since my engines are 6 cylinders it should go there but I don't want to assume.

Your help is greatly appreciated,
Thanks,
Dennis