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With a oil pump, mostly.
Oil pressure switches have various levels at which they activate and different engines operate safely at different oil pressures and different revs, hence the need for variable switches. I'm not sure what you want me to google really. You wouldn't want to fit a switch set for an old JCB to a superbike.
I have a car on which the oil pressure light is always on when hot and below 2krpm. It's designed to be like that. The warning light on my old 911 regularly stayed on at altitude when at low revs and hot. Neither seized. I once tore out the sump plug on my old Beetle on a speed bump and it dumped it's oil. I saw the light and turned it off quickly. It went on for another 15,000 miles in my hands.
I'm not saying you can't break an engine running the pressure too low, of course you can, I'm saying just because the light came on doesn't mean that the engine is toast.
Why do you think they fit a warning light?
Firstly find out how a piston engine creates oil pressure, it is not the oil pump. Here you go https://www.youtube.com/watch?v=8f2fcbTh5yw
The last few manuals I have read, if the oil light comes on stop car immediately, do not drive the vehicle again, get transported to the dealer etc.
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lynx
With a oil pump, mostly.
Oil pressure switches have various levels at which they activate and different engines operate safely at different oil pressures and different revs, hence the need for variable switches. I'm not sure what you want me to google really. You wouldn't want to fit a switch set for an old JCB to a superbike.
I have a car on which the oil pressure light is always on when hot and below 2krpm. It's designed to be like that. The warning light on my old 911 regularly stayed on at altitude when at low revs and hot. Neither seized. I once tore out the sump plug on my old Beetle on a speed bump and it dumped it's oil. I saw the light and turned it off quickly. It went on for another 15,000 miles in my hands.
I'm not saying you can't break an engine running the pressure too low, of course you can, I'm saying just because the light came on doesn't mean that the engine is toast.
Why do you think they fit a warning light?