You say Aero 80 oil. To drift slightly, Straight 80 (or whatever viscosity grade recommended) is usually used for breaking in new engines and ashless dispersant (W prefix) thereafter, depending on the engine manufacturer. This could be after 25, 50 or 100 hours of operation.
If you've got oil pressure problems this soon after overhaul, you should be raising the issue with your maintenance organisation or the overhaul facility as the engine will be under warranty.
I wouldn't be flying it with those indications.
What aircraft is it btw?