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Seems odd to have a 3 speed wiper switch for Back Up lamps. But whatever. And yes that will work for wipers. Just a bit confused as to what you are doing. Good Luck.
https://www.steelsoldiers.com/threads/cucvrus-repair-projects.192437/page-18#lg=post-2386184&slide=1
See if this helps you. It is an inexpensive switch that snaps on the bottom side of the steering column. 2 wires and that is all. Good Luck.