The maxi drive for the rear is vacuum operated. Not sure about the front, maybe you can modify an air operated one to run on vacuum...
EDIT: Oh yeah, McNamara make a vacuum operated diff locks.
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That doesn't mean much, their not a computer savvy bunch at jacmac, i think they still have an IBM286 computer they use😊. Its very old school, all real old machinary, its pretty cool. So guessing they haven't updated the website since it was first done😊
That's a bummer, I would have liked twin vac lockers.
I think I remember someone recently trying to get a front maxi but i think they had trouble with the 10 spline or something..