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I'm at work and cannot do what you ask at the moment, but I'm not sure you need me to. the Haynes manual has a reasonable set of electrical diagrams, and the Pelican site has reproduced them online. On the relevant (1980 or thereabouts) diagram, the speedometer should show the colors of the wires that are attached, and the numbers of the terminals (spade connectors) to which they attach. the terminal numbers will be visible next to the terminals on the back of the speedo.
There really is no substitute for using the electrical diagram when troubleshooting stuff like this. Good luck!
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'83 SC
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