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This would be an interesting test. But I returned the fuel pressure test kit to Auto Zone yesterday - having already made up my mind that I should get a new fuel pump.
If I'm still having issues after the new FP is installed, I'll circle back to this post and try your test.
You can still do this test without a pressure gauge. If you disconnect the oil sender with several wires (not the one with a single wire) and it no longer starts, then you know the issue is with the fuel pump relay or circuit.