Have you figured out the problem? I just noticed the same behavior today. The boost gauge will fluctuate between maybe 1/2 and 1/4 up the gauge under...
Exactly how my rear bumper looked when I got rear ended. Check to see if your impact bar got bent at all. I thought the impact I sustained was super...
Just to add, all warmed up, the oil pressure should not be in the middle at idle. That's way too high. Most people seem to idle with warm oil around...