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Tach don't work

I need some help on getting the tach to work on my 72. i up graded the ignition to a run ready MSD distributor with an 6AL box. The tach didn't work at first. MSD had me buy an adaptor and now it works up to 3500 and then bounces around after that. Does anybody have any ideas why it will not go higher then 3500.
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