So lots of unmanned engines have murphys switches incase of a failure when no ones around. Engine over heat or low oil pressure....ect. This is my question, how do these monitor engine temperature and oil pressure? Do they get feedback from the gauges or do they have separate sensors that monitor electrical resistance and such to find out these values? Mainly I'm curious because if one of thoes gauges were to get stuck or fail, like my oil pressure gauge sits in the same spot all the time, would this make that safety switch not work? Mainly just a curiosity sort of thing as I have a bad oil pressure guage on an engine with a murphys switch and I'm like.... does this disable my murphys switch in the cause of a failure in the oil system? The gauge sits at 30 no matter if the engine Is on or off.