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It's obviously an added-on warning light for something. Follow the wires and see where they go. If the wiring is gone, then just remove it. It could be for anything some PO could conjure up, but probably meaningless to you.
I had a horrible thought, that everyone came up with their idea of what the light was for, what it warned about. Maybe the tail gate open warning light. Or, headlights on warning light.
I have not jumped into the cab yet to see what is what. I will do all the tracing then. What all of you have said is that it is not something Ford did so I do not need to try any part it goes with. The truck has a heater.
Thanks, if it does something interesting when I get to the cab this winter I will post a thread.