Oil leak

Buy the new part so you have something to look at, then find the similar part near the oil filter. On older cars there was a switch AND a sending unit for cars with oil pressure gauges. They are not interchangeable. If your car doesn't have a gauge, you need a switch for the warning light.

Most newer cars use a combination sending unit when a gauge and warning light are used. Those will have two wires in the connector. Switches and newer ending units require a special six-point socket with rounded corners although you might get the old one off with a standard socket or wrench if there is room. Many older sending units had a nut next to the threads. They were easy to remove with an open end wrench, typically about a 5/8".

Caradiodoc