On a related topic - my pump is a Gould JRS5, and I can only get about 55
psi out of it with everything turned off. How much pressure should I be
able to get? Under load, say 3 impact sprinklers, I can only get about 30
psi.

NM, I just found the specs. It's good to 25 feet. Max pressure seems to be
64psi, but I can't get it past 55. I guess that's not too bad. Default
regulator settings are 30/50 psi, I have it set at 20/40 psi.