Try a higher grade of oil for starters. Check the hydraulic lifters for wear by doing a leak down test. Check the rocker pivots for excessive wear. All these things will help loose oil pressure when the oil gets hot.
SOURCE: drop in oil pressure
The oil sending unit could be bad, or the pressure relief valve in the oil pump is malfunctioning.
SOURCE: 1991 chevy S10 blazer fluctuating oil pressure
I assume from the year it has high mileage. With mileage comes wear in these engine's bearings allowing oil pressure to drop because of the excess clearance between cam and bearings, also the crank and bearings. When the engine is hot and idling the oil is thinner and goes by the bearings quicker. If you have good oil pressure while driving, I'd leave it alone, maybe use a thicker oil or some lucas additive. My 89 does the same thing sometimes in the summer, but don't remember it doing it this summer. I use Mobil-1 and an AC Delco filter.
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SOURCE: 2001 Jeep Oil Pressure
Last week my 2001 Grand Cherokee with a 4.7 was dropping below 10 and my "check gauges" light and chime came on. My sending unit was bad. I could see it was bad because oil was getting through the unit and leaking very slow. It's located above the oil filter. Easy fix, but the unit was over $50 and the 1 1/16 special deep socket for sending units was over $10.
SOURCE: 2001 Chevy express van oil pressure
Did you verify oil pressure with an oil pressure gauge besides the one on the instrument cluster?
SOURCE: fluctuating oil pressure on 2002 blazer
do you change oil at recommended intervals when the engine runs at higher RPM's it's normal for oil pressure to increase while driving
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