I teed in a 5psi pressure relief valve just before the pressure solenoid on the rave assembly. The pressure and vacuum solenoids are designed to operate off of 4 - 5 psi of pulse from the crankcase. I ran it up to 16 lbs of boost today in the bean field and it held fine.
I attached a page out of the manual that has a pretty good graphic and description of the P/V solenoids.
If you have questions phone Mark @ Supreme Tool. They are not posted on their web site as of yet. I don't even know if they are in production either. Mark said April?