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No tachometer signal

Electrical

Vehicle Information: Year: 1978; Body Type: Coupe;

My CD box has no tachometer signal coming from the black/violet wire terminal on the CD box. Does that mean the CD box is bad? The engine runs fine. I do get the tachometer to work if I take the distributor signal green wire and jump it to the black/violet wire going to the tachometer but the tachometer is not as accurate.

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