what about that ? : http://www.ebay.com/itm/Rao-s-High-Suct ... 3381b71d18
continus running pump ( word on the street is pumps can run continusly for around 2 years !! ) and this, and that's it
it does not turn on and of, does not bleed, it just gives the amount of vac you ask for, that's it....
maybe ad check valve and vac reserve and turn of yourself ? but, what do you think ?