The oil pressure sending unit on a 1992 Jeep Wrangler with a 4-cylinder engine (likely the 2.5L) is located on the
driver's side of the engine block, near the front. It's a relatively small unit with one or two wires connected to it. You'll likely need to look closely and possibly use a flashlight to locate it, as it can be somewhat tucked away. It's usually a threaded fitting, and often near the oil filter.
Keep in mind that access might be limited depending on what other components are in the way. A repair manual specific to your Jeep's year and engine will be the most helpful resource for precise location and removal instructions.
