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Did the tach work before it was installed? This seems stupid, but devices of this vintage often times go bad and need to be rebuilt.
Only things I can think of is check to see if it has a good ground (-) connection, it is receiving power and make sure the actual wire (I believe it is brownish tan) that goes to the coil is connected. Also you didn't mention if you have stock points or you're running HEI, this makes a difference on things to check.
 
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