Had a little thought. Thinking it would be possible to run the SLS off the PS pump. This would nothing new. My Mark V ran the brake boost off of the PS pump.

Questions would be operating pressures of each system. And fluid compatibility. Otherwise I would think it would be a matter of installed a t fitting or two and a little bit of work.

__________________
1991 560 SEL / 185k miles
1992 750il / 17k miles - project car