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Where is the oil pressure sending unit for 03 Chevy Tahoe?

The oil pressure sending unit on a 2003 Chevy Tahoe is located on the driver's side of the engine block, near the oil filter. It's a relatively small unit with one or two wires connected to it. You'll likely need to get underneath the vehicle to see it clearly. Be aware that the engine will be hot if it has recently been running.