I agree with BT,start with simple and accurate tests. You can get a manual guage at Walmart or any local parts store for very little money. If you get the same results and the oil drain back passages on the top of the heads ( under valve covers are clear ) I think you'll find a dirty p/u or other pump issue. Hope it's just a bad sender but I'm not sure where at idle you are getting lifter noise which indicates lack of oil getting to them.
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