Why 10.7 volt input at ‘71 Duster instrument panel?

Ken71Twister said

Also - with the engine running - the voltage at the instrument cluster plug is over 13 V. I also found another pin for dash lights that reads 11.9 V with the engine running. Maybe I’m ok with the voltage issue. I didn’t run the engine earlier because I was in the garage and had a gas leak at the carb check valve that I’ve since fixed.

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I would concentrate on voltage with engine stopped. Maybe I missed this--HAVE YOU CHECKED the battery itself with everything off, and again with key in "run" like as you make your measurements, only measuring at the battery? Maybe the battery is low or even defective/ worn out. Fully charged battery should be about 12.6. Any load on that is going to pull it down some, but even cranking, battery should be above 10.5