Where is the oil sending unit on a 3 8 1995 Pontiac engine?

The oil pressure sending unit on a 1995 Pontiac 3.8L engine (series 1 or series 2) is located on the driver's side of the engine block, near the oil filter. It's a relatively small unit with one or two wires connected to it. You'll likely find it near the bottom front of the engine block.

However, precise location can vary slightly depending on the specific engine configuration and accessories. It's best to consult a repair manual specific to your year and model Pontiac with the 3.8L engine to get the most accurate visual. A picture in the manual will be much more helpful than a general description.