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An oil pressure gauge is an tool that measures the pressure of oil circulating in any lubricating system. In a car, the oil pressure gauge activates the oil light on the dash when the car's oil supply is running low.
The oil pressure depends on speed, engine temperature, and amount of oil present. Maintaining the correct amount of oil in a car can increase the longevity of the vehicle; the same is true in machinery. Many lubrication systems rely on oil pressure gauges to ensure that equipment receives the correct amount of lubrication.
Normal atmospheric pressure is 14.7 psi; gauges typically use a Bourdon tube to measure pressures 15 psi or more. A Bourdon tube is a thin walled elastic tube of metal that is flat and formed into a C-shape, which flexes in response to a change in pressure. When a pressure change of oil occurs, the metal tube flexes, inciting a change in reading.