1980 Mustang wiring question on the gauge cluster.
Pulled out the dash cluster to replace my speedometer cable and found a green single connector that was not hooked up.
Any idea where it is to go? It fits the studs on the back of the gauges. Has a black wire with green dots.

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On the back of the cluster on the circuit board there is one stud marked "green" logically I want to put it there, but I also do not want to short anything out.

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I searched through the schematics I have but could find no reference to it.