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Interesting setup, however one more "link" in the puzzle? I can't see how the supply hose is secured to the T or the engine, but it would be good to inspect it often. I worked on 2 VW diesels, installing gauges in both of them using steel T's, which I checked often for signs of fatigue. After 3 or so years of use they were sound, even after taking a wrench to them.I actually think that the solution on my boat is better. There is a hydraulic high pressure hose screwed into where the oil pressure switch would normally go, and this is run to a bulkhead in the engine room. There is a "T" fitting on the other end of the hose, on the bulkhead, and an oil pressure switch, and oil pressure sender on the T. This reduces the mass connected to the vibrating engine by a pressurized T fitting, and isolates the switches from the effect of vibration.
Here is an OLD picture, in which you can see the hose, pressure switch, "T", and sender to the right of the OLD Sea Ranger battery charger (now gone);