The oil pressure sending unit on a 3.8L GM V6 engine (the "GM 3800 Series II" is the most common iteration, but this can vary slightly based on the exact year and model) is typically located on the
passenger side of the engine block, near the
oil filter. It's often a relatively small, one-wire sensor.
However, it's crucial to consult a repair manual specific to your vehicle's year and model. The exact location can vary slightly depending on the year and specific application of the engine. A diagram in a repair manual will give you the most accurate and reliable information.
