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Hello Ed
The Tacho wires into the breaker plug of the mag, there should be 2 wires, one is a ground which goes back to the ground pin of the tachometer and the breaker wire which goes back to the Tan coloured wirs on the tachometer, there is a noise filter in between mounted on the firewall, check that this is ok and no wires are off it.
Regards
Pete
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