Our '05 Tahoe has an oil leak. Its been going on for quite a while. I was quite confident it was coming from top side, and have been monitoring it closely. I'm about 99% certain its the back side of the valley pan. So with that said, I'm going to be doing intake manifold gasket and valley pan gasket. We don't currently have any knock sensor issues, but while I have it apart, I figure I might as well change those as well as the seals. Looking online and at Rock auto, I see Dorman brand knock sensors. I've had good luck with Dorman brand items over the years, but are thse any good? And do I actually need a new harness as well? I suspect not. Just trying to finish up my list of parts I'll need so I can place my order. Not worried about oil sending unit as its newer, and not wet around the area. I'm also seeing this kit. Wasn't sure if its any good or not...