Where is the oil pressure sending unit for Chevy 5.3L V8?

The oil pressure sending unit location on a Chevy 5.3L V8 engine varies slightly depending on the year and specific engine configuration, but it's generally located on the front of the engine block, near the oil filter. It's often a small, cylindrical unit with a single wire connector. You'll likely need to look closely in that area to locate it. A repair manual specific to your vehicle's year and model will give you the most precise location.