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Most tachs have three wires, one for the signal from the distributor, one for ground (might be deleted if tach is grounded via the mount i.e. all metal housing), and one for the illumination lamp. What are the colors of the wires or are they labeled at all? The one for the distributor signal would be the wire that goes from the points to the coil. This is assuming an HEI distributor has not been installed as a modification on the car.
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Dan
'46 2 door
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