Okay, I'm confused. I have a 03 Denali and when I bought the sending unit to diagram showed the sending unit on the passenger side near the starter. I had recently "practiced" taking out the starter when I had a relay go out on the truck, so I was familiar with the area. Strange thing is that when I went under the truck the part that looked like the one in the diagram has a oval connection, sort of light the head lamp plugs. I call the parts place and they said that was the only unit for the Yukon. I haven't looked on top or on the drivers side but I want to get more information before I get something torn up to bad to be able to drive it into my mechanic and dish out half an hour of labor, plus the OEM he wanted to sell me for $80. So am I destine to hug my engine like CHAZMAN or is the 03 where the O'Rielly's diagram said it was?