Where is the oil pressure sending unit on 2002 jeep grand Cherokee limited v8?

The oil pressure sending unit on a 2002 Jeep Grand Cherokee Limited V8 is located on the passenger side of the engine block, near the front of the engine. It's a relatively small sensor, and you'll likely need to get underneath the vehicle to see it clearly. It's usually wired and might have a single or a couple of wires connected. However, be aware that some minor variations might exist depending on the exact engine (4.7L or 4.0L, though you specified V8 which points to the 4.7L). A detailed diagram from a repair manual specific to your vehicle's year and engine would be the most definitive resource for its precise location.