At idle the oil pressure should be somewhere around 5 psi. Above idle the pressure will generally increase about 10 psi per 1k of rpm. So say at 3000 rpm you'll probably see something around 30 psi.
That's a stock system of course. Any oil system mods (and there are several) could effect your readings. I'd find a good reputable mechanic and put a direct-read gauge on there to find out what your pump is really doing if you're concerned about it.
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