Thanks Sprock, but I looked into that, it's dyed water, the new manometers work on the died water principle, but I figured out a way to do it with four hoses that will do all four at the same time. Basically I only need a 4 foot long pieces of hose, a little piece of hose, some t joints, and some two stroke oil, by doing that each one compares to the other instead of showing the total vacuum, which would literally be through the roof.