Yes, there is a fitting in what appears to be the identical spot at rear of the cylinder head that is shown in your video.
This connects to a rigid steel pipe (quite small in diameter) that travels downwards alongside the block and attaches to the block close to the starter motor. No idea what its purpose is, not shown in any of the diagrams in my shop manual. That said, I would be surprised if this was after-market since this 1965 mark I “Spitfire 4” was extremely original when I bought it. (But I'm third owner, so who knows?) Because of its location I believe that unscrewing it probably would have the same result in terms of seeing if I have oil flow in the engine.
The engine ran well when I bought it and never noticed the oil warning light. But carbs leaked gas copiously and it took me a couple of years (believe it or not) to figure out what was wrong, something simple as it turned out. Because of the long wait without running the engine I changed oil and filter before starting. It started on first try (after first cranking with starter motor a couple of times with coil disconnected). The little blue light came on right away. As far as what I've done to the car, ninety percent of what I've done since buying it has been cosmetic. No engine work at all aside from carbs and new spark plugs, coil, and spark plug wires.
A lot of the mystery would probably be solved with a pressure gauge but I simply CANNOT get the sensor unit off. I will definitely try testing the sensor with the method you are suggesting.
Probably I won't be working on it anytime soon however, because about to go on an extended trip overseas to visit wife's relatives (hooray). Very much appreciate all the advice you guys have been giving me. Will re-visit the blog once I am back and ready to tackle the subject again.
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