What is an Oil Pressure Sensor?
An oil pressure sensor is a device used to measure the oil pressure on an engine. Oil pressure sensor is actually a term that covers at least two different and distinct types of sensor - an oil pressure switch and and oil pressure sender.
Find out what an oil pressure switch is here and what an oil pressure sender is here. There are also many devices that combine an oil pressure switch and oil pressure sender into a single unit - a combination oil pressure switch and oil pressure sender.
How to test an oil pressure sensor?
Testing an oil pressure sensor depends on its type and purpose. Testing is usually done using an electrical testing tool called a multimeter. As with all testing it should be done by someone qualified to do so and be competent to perform the test.