The ball type pumps don’t seem to work as well to me, So I converted mine using what is called a mighty vac.
I know that this might sound a little crazy at first but it works just as good as those expensive pumps sold on the market. The mighty vac is sold in the automotive in most department stores like walmart, Kmart, etc not to mention your local automotive store. This vac has a pressure gage and release valve built in to it.
the actual use for this pump is to bleed the brakes on a automobile. Keep the preasure around 15 to 20 psi.