gauge/shutoff switch threading

Are these gauge/switches reliable enough to rely on it to turn off a pump with a burst disc at 5K as backup if it fails.
What is the threading on this gauges 1/8 NPT, BSPP, BSPT, of something else? It is really hard to tell the difference between 1/8 NPT and BSPT, 55 vs 60 degrees.


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