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Where is the oil sending unit located on a 1999 Chevy Tahoe?

The oil pressure sending unit on a 1999 Chevy Tahoe is located on the passenger side of the engine block, near the front. It's usually a small, cylindrical sensor with one or two wires connected to it. You'll likely need to look closely near the oil filter and oil cooler lines to find it. Because it's somewhat difficult to get to you may need to consult a repair manual or a diagram specific to your engine (4.8L, 5.7L etc.) for its exact placement.