the original wiper motor is controlled via a cable that pushed the internal mechanical switch on the wiper motor from off to slow to fast, I doubt that multi position switch will be of any use to you except to run the washer [the W termnal], which you could do with a toggle switch - the other 4 posts would be different speeds which would have to be controlled by some resistors in the switch .... meant for modern replacement wiper motors I'd think
Bill
