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Your wiper switch is starts the wipers by pulling down and adjusting the speed by turning or rotating the knob.

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Thanks for the confirmation. I thought that had to be what it was. I currently have know idea if the speed control aspect works since that is vacuum operated vs mechanical for on/off. The switch is out of the car and will be for a while.

Do you know how to bench test the switch and how to service it if it isn't working correctly?

I don't know how to repair it, if its not working. It is a diaphragm so if it breaks or becomes hard I don't know who can rebuild it, maybe someone who rebuilds vacuum advance units.

For now, the worst case scenario is that my wipers may may just be single speed. I don't anticipate needing the wipers often. At least not until I get to the point where I'm ready to take a long tour with the car.

You could probably hook the switch to a known good vacuum source (anothrt car, or vacuum pump) then check it the output side with a vacuum gauge.