I didn't get it to work. Somehow Gish messes it up. [immediate edit: I found a new way, am now testing it [another edit: Gish messes it up]] And it's too big for any general-purpose vehicle. A way which certainly works, is small and doesn't deform wheels too much is connecting the 5-8 pistons in the direction you want (clockwise or ccw), starting at the closest anchor of the wheel.