Where is the oil sending unit on a 2003 Chevy Silverado 4.8 liter V8?

The oil pressure sending unit on a 2003 Chevy Silverado 4.8L V8 is located on the driver's side (left) of the engine block, near the front. It's a relatively small unit, usually with a single wire connected to it. It's often near the oil filter, but not always directly on top of or attached to it. You'll likely need to look closely around that area to locate it. A shop manual or a picture specific to your year and engine will be very helpful in pinpointing its exact location.