Where is the oil sending unit located on a 2001 Chevy Blazer?

The oil pressure sending unit on a 2001 Chevy Blazer is located on the engine block, near the oil filter. However, the exact position can vary slightly depending on the engine (4.3L V6 or 5.7L V8). It's usually a small, one-wire sensor with a single electrical connector. You'll likely need to consult a repair manual specific to your Blazer's engine to pinpoint its precise location. A picture of the engine bay would also help someone familiar with these vehicles guide you.