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Don't know what type ignition system you've got. If you have an MSD system, check your ignition system output to the tach. The tach output on my MSD 6AL box is supposed to be 1-5 VDC, motor idling, output wire disconnected. The output of the tach adapter fed by the 6AL output should be 2-3 VAC. The output of the tach adapter should be disconnnected from the tach for this measurement. All this checked out in my car, so I replaced my tach, which fixed my problem.
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