What does an oil pump switch do?

Answer 1

I really have not heard the term oil pump switch. There is an oil pressure switch on some small engines that will shut the engine down if the oil pressure falls below a preset pressure. These are not installed on vehicles for safety reasons. You vehicle however has an oil pressure sending unit that keeps track of the oil pressure and will warn you of low oil pressure with a red light, or by way of a gage, or both.