Where is the oil pressure sending unit located on a 2005 Chevy trail blazer?

The oil pressure sending unit on a 2005 Chevy Trailblazer is located on the passenger side of the engine block, near the oil filter. It's usually a smaller sensor with a single wire connected to it. However, the exact location can vary slightly depending on the engine (4.2L I6 or 5.3L V8). It's best to consult a repair manual specific to your engine for a precise visual location. A picture search online for "2005 Chevy Trailblazer oil pressure sending unit location" with your specific engine size added might be very helpful as well.