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1. you can remove the tube and plug the hole in the side cover where the tube runs to the pump in in the side cover and see if that helps. The lower tube, it is pressure and the upper is a return. 2. Try turning the pressure relief valve screw in on the engine oil pump. Its under the front of the engine, and the relief valve screw is on the other side of the engine from the front cover. 3. If that doesn't work, remove the big nut the little screw is in, the spring and the plunger and make sure the plunger is not stuck and is free to move in the bore. And the bore is clean and not full of goo. 4. The pickup screen could also be full of goo. 5. The next thing I think of is to check inside for bearing clearance. Too much clearance bleeds off oil pressure. Also, when you remove the cover make sure the cover gasket is in good condition around where the cover has the fitting for the side cover oil pump. 6. I guess the 1/2 moon keys in the oil pump gear in the pump or a pin in the drive gear off the camshaft could have sheared on the oil pump shaft, I doubt it since you say it pumps but has no pressure. It is a thing to check. 7. The pressure is supposed to be around 30 psi and it doesn't make much difference what guage you use as long as it reads to 30 psi and is in good working condition. This is probably not everything to check, its just all I can think of.
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