Yes. I did some reading and found that out a while back I posted it in a thread here. Looks like you will probably beat me to doing it though. Should be able to just drop a relay in like you would for the fuel pump (same trigger circuit for sure) and to be honest could probably be the same relay if you get right down to it I don't think it will draw that much current that a 30 amp relay probably wouldnt take care of both but separate is always good for minimizing failure points. With hydroboost vacuum isn't a critical need anymore so if it dies you don't want it to take out the fuel pump. I was looking at doing my own vacuum pump and then started reading about the SD's being electric and thought huh... why not use something that is tested in the application instead of guessing and worrying about reliablity. The pressure switch will make it litterally plug and play. The thing that I was working on was figuring out what to run for a ballast (that soup can thing if you had cruise control on the older trucks). Mine is rotted. I know a thing or two about vacuum systems. The ballast is important because it lets you run a smaller pump if your duty cycle isnt constant. Like for example if you only need vacuum to actuate the heater box or the exhaust brake, it would take a sizeable pump to do that on demand and quickly. You can sorta think about it as a resovoir like an air tank or accumulator for well pump system but its a little strange because its just a resovoir of empty space at reduced pressure. As far as tanks, I think I'm going to go with a nice gallon tank I found on amazon a while back.