Just a little FYI for some of those with presure variation questions that I've seen, I just thought I'd add my recent experience to the mix. Just installed an LS6 intake on my '00 WS6 and in the process of doing so.. *snap* goes the oil pressure sending unit!

I went ahead and picked up another one at a local parts store, installed it, and sure enough next time I start the car I'm now seeing about 70psi cold pressure vs. the 60psi cold start presure I was getting previously.

The only thing that changed.. different sensor. I guess that confirms my suspicions about the accuracy of those stock gauges lol!