The green wire is from the VSS (Vehicle Speed Sensor) and is used for an alarm buzzer or a engine adjustment above a certain speed. The green wire goes to a pin on the left of pin#7 from the round connector. It doesn't show in posting 10 and 19 but there are good pictures and good info in this thread: https://forum.ih8mud.com/40-55-series-tech/463085-late-model-speedo-refurb-help-needed-please.html
Good luck and happy driving
Rudi
Good luck and happy driving

Rudi
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