So my oil pressure gauge shows I have low oil pressure. I have a brand new sensor I just put on last week (problem was present before that) and it still shows low. I ended up removing the valve cover, because I remember I did that once and started the engine and a bunch of oil shot out all over the exhaust manifold and engine bay. That time there was no issue with the oil pressure. I did the same thing just to see if I was still going to see that sort of pressure and yes, the same thing- oil everywhere, but I was prepared for it this time. I currently have another m103 on the engine stand now and I'm examining the oil pump on that and can't see how this thing could possibly fail even a little. There is an extremely sturdy and solid mesh armour that prevents anything larger than maybe 1mm or so from being sucked up by the pump and also just by looking at it, if it fails it would seem that there would be no oil at all. Starting the engine first thing, the oil is normal and pressure seems fine, but after about 20+ minutes it drops by about 1 bar, then after about 30 minutes it will completely drop or nearly be resting on the peg. I may be missing something because even resting on the peg at idle, there is oil going everywhere. I let it idle and looked through the oil cap opening (valve cover back on) and could see a steady stream of oil pouring from the top camshaft oil pipe and when given acceleration the oil increases and begins flowing at greater force. I checked the connection of the readings from the pressure sensor and those are correct as well (e.g, 1 bar=63-76 ohms, 2.5 bar=148-167 ohms, etc). So what am I missing?

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1990 190E 3.0L