low oil pressure 96 S-10 blazer 4.3L

I Just Replaced Upper And Lower Intake Gaskets And Now I Have Little To No Oil Pressure.
I Replaced The Oil Pressure Sensor And Still Have Little Oil Pressure.
My Truck Is A 96 Blazer With 4.3l Central Multiport Fuel Injection And I Have Also Replaced The Spider Injector.
I Have Gone Back Over My Work Several Times And Can Find No Connection With The Work I've Done To Losing Oil Pressure

Remove the oil sender and use a manual oil pressure gauge to test the pressure. Engine at operating temperature, 1500 RPM and also at idle, post your results.

5 Psi At Idle And Around 20 Psi At 1500 Rpm

If those readings are from a manual oil pressure gauge, it's time to pull the oil pan and find out what's worn. It could be the oil pump, main bearings, rod bearings, or even a restricted oil pick up screen. Continuing to drive it will do more damage.

I Just Replaced Upper And Lower Intake Gaskets And Now I Have Little To No Oil Pressure. . .
Any chance some of the old gasket or other crud got into the oil or passage ways when replacing the gaskets?

pickup screen looks good but i do have one loose rod bearing

A loose or worn rod bearing will cause oil pressure to drop. The oiling system supplies the main and rod bearings first, then the camshaft bearings. Whatever is "leftover" after that goes to the lifters and rockers. Check main and rod bearing clearances and repair as necessary.