70 duster 2 speed wiper upgrade to electric washer

You would be better off doing what I am planning on doing with my sons 69 notch w 2 speed setup. Adding a water proof momentary contact switch to an old foot pump washer pump bracket I modded to suit. Easy to wire up etc. The 67 only 2 speed with electric washer i know of is a completely different switch. You will need a different 67 only plug and figure out how repin you 72s wiring to make it work.