The oil pressure switch is near the oil filter. If you look below, you'll see a pics attached. I highlighted the switch and where it mounts. (Pic 1)
The idea that there are no noises from the engine is a somewhat good indicator that there is oil pressure. However, it should be checked.
To check the oil pressure, you will need to get a mechanical oil pressure gauge. Most parts stores will lend one to you.
If you look below at the attachments starting with the second pic, I included the directions and oil pressure specifications from the manufacturer.
If you want to access the oil pump itself, you will need to remove the oil pan from the bottom of the engine. There is a screen that can get plugged on the pick-up tube end. So, check that.
Starting with pic 5 below, are the directions and pics for oil pump replacement.
I hope this helps. Let me know what you find or if you have other questions.
PS: I would first replace the oil pressure switch to see if it fixes the issue. If it doesn't, then follow the procedures I provided. I say this simply because the engine is running properly and there are no odd noises from it.
See pics below.
Images (Click to enlarge)
Monday, April 12th, 2021 AT 7:19 PM