Pressure gauge is there more for if you were to have a clog or for some reason pressure is going through the roof.... A lot of guys will have a pressure gauge and relief valve so you don't mess things up to bad.. My pump runs at about 4 PSI but if I looked at my gauge and it said 15 or 20 something is WRONG!!! Just a helper so you know what your pump is doing....

RC

The only difference between a rut and a Grave is the depth. So get up get out of that rut and get moving!! Time to work!!