Shurflo Pump Question

[CampHamp]

Vaccum question in general...I have seen people say they get different vac readings on different gauges in the same system. Both of my gauges always read the same thing. What does this mean?Shouldn't there be better vac higher in the system?

You get better vac at the top if your tube is full of sap and gravity is pulling on that column. That happens with 3/16 tubing and, on a good run with enough taps, it would happen on 5/16. Otherwise gravity isn't helping you so, no - think of how the suction drops at the end of your shop-vac is when it's full of water... If the line is all air (little friction) then the vac would be the same, I think.