Where is the oil sending unit on a 2001 ford ranger V6 3.0L?

The oil pressure sending unit on a 2001 Ford Ranger 3.0L V6 is located on the passenger side (right side) of the engine block, near the oil filter. It's usually a small, single-wire sensor with a threaded connection. You'll likely need to look closely near the oil filter to find it. It might be somewhat difficult to access depending on other components in the engine bay.