WIll this unit provide enough vacuum continuously for our wiper motors?
That's the same pump that's on my 7.3L Diesel. It only runs the HVAC controls (most modern wipers are electric). That system uses a vacuum reservoir of about 1/2 gallon capacity and the HVAC controls only operate intermittently.
I have my doubts whether it would handle a continuous demand. I might go tie in my wiper motor to the truck and see, but it would be a while before I could get to that.