Oil Pressure gauge freaking out

This is extremely simple to explain. It's not air in the line, it's not a defective gauge, blah blah, bullshit, bullshit, crap, crap, crap.......

The gauge is simply following the engine RPM. Look at the first video. Although short, I can tell you have a healthy camshaft. The gauge is simply following along with the engine RPM as it runs. The engine RPM is not steady at all at idle with a healthy camshaft so it fluctuates and the oil pressure gauge simply mirrors that. Not a damn thing in the world wrong with anything.