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The green wire is there for an original points style ignition. The green wire runs from the (-) terminal on the coil to the input on the tach. I believe it is wire #54 on the old style harness under the dash.
The MSD box sends the tach signal rather than the tach getting a signal from the coil like an original Cobra. So, you have to make up a new wire from the MSD box to the coil, and all is well.
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