You might check the J.C. Whitney catalogue. At one time, they had universal kits.to adapt any electrical wiper.to an interval wiper. It seems to me that there was a little box that hung under the dash with a knob to adjust the length of delay. I don’t know if these interval wiper kits are still available but you might go online to the J.C. Whitney website and check.
My 1947 Pontiac and my 1950 Chevrolet pickup truck had interval wipers. They operated from engine vacuum and only swiped the windshield when you let up on the accelerator.
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