Where is the oil pressure switch on a 2004 Chevrolet avalanch 5.3L?

The oil pressure switch on a 2004 Chevrolet Avalanche 5.3L is located on the driver's side of the engine block, near the oil filter. It's a relatively small switch, often with one or two wires connected to it. You'll likely need to get underneath the vehicle to see it clearly. Be careful working in that area as it is hot when the engine is running. Always allow the engine to cool completely before working on it.