The important thing is, it is getting oil under pressure.
Without a gauge you would not know and wouldn't worry.
A little loss in the bearings on the crank mains/rods also cam bearings,
and a little loss in the possible worn pump, adds up to what you are seeing.
I'd not worry, I don't see anything that concerns me on that gauge.
Remember, a lot of engines are splash lubricated.
It will prolly out last what it is powering!
You have been in it, so you know for sure what it looks like in there.