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Where is the oil sending unit located on a 04 Chevy pickup 2500 HD 6.0 engine?

The oil pressure sending unit on a 2004 Chevy Silverado 2500 HD with the 6.0L engine is located on the driver's side (left side) of the engine block, near the oil filter. It's a relatively small unit, and you might need to look closely. It's usually a single-wire sensor. Be aware that there may also be other sensors in the vicinity, so make sure you identify the correct one by consulting a repair manual or diagram for your specific vehicle.