OK, here's the answer you're looking for, between 30 and 40, See picture below, link, http://www.gmtruckclub.com/forum/threads/oil-pressure-gauge-what- should-it-read-for-a-5-3l-with-dexos1-oil.100410/
Check your oil sensor and filter..may need to change it.
My 5.3L v8 flex fuel engine cold start oil pressure is at 40psi and drops to 20psi 600 rpms when warm. The trucks idle gets rough when it drops under 20psi or 500rpms.
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