Only way I can see that happening is you have a massive head gasket leak or the block cracked along the cooland passage. I favor the former over the latter. Coolant mixed in with oil will thin it out and drop pressure.
Do you have any coolant in the radiator? yes - what color? black,...
Easier and cheaper to replace the OPSU (Oil Pressure Sending Unit) 1st. They go thru many heat cycles and become brittle and wear out. I'd swap in a new one 1st before going in the oil pump.
Now if you still have the issue.
1 - get you a new timing chain. If you've been running the stock...
Throw out bearing or even the pilot bearing. Cheap insurance to change the pilot bearing while there.
But another important question, how old is the clutch? Original?
If so time to look at a replacement, depending on how you abuse it, stock clutches last between 75-120k miles.
You...
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