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Where is the oil sending unit on a 2004 Chevy Silverado 5.3 liter V8?

The oil pressure sending unit on a 2004 Chevy Silverado 5.3L V8 is located on the driver's side (left side) of the engine block, near the oil filter. It's a relatively small unit, and often a single-wire connection. You might need to look closely around the oil filter to find it. It's usually a threaded fitting.