confused about sprinklers and psi


Hello list.
 I'm looking at some tripod sprinklers for my patch this year and could use some help. the sprinklers require at least 25psi to operate, the catalog also says that it will water up to an 80' diameter. my patch is an L shape, one part is 60'x60' and the other part is roughly 42'x 70'. I run the patch water with well water from the hose. I do not know the psi but have ordered a pressure guage, assuming there is enough to run 1, can I run 2 of them at the same time or does the psi get divided between the 2? I realize I can alternate them but I was just wondering how it worked. is there an average psi for well pumps? Any help will be appreciated.
Thanks and good luck this year
Amy


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