I have a 2007 with a 2005 engine swapped in after my motor went out. I'm seeing fluctuations of 65-100 psi on my oil pressure gauge if I am on the throttle, and usually fluctuations of 20-26 psi at idle. Sometimes after driving for a bit on the highway I see it drop below 10psi at idle. My Aem oil pressure gauge is running off a Ptuning oil block that is feeding the turbo. The turbo oil drain is tapped at the timing chain cover. The stock fuel pressure sensor is also attached to the Ptuning oil block.

I am also running a canton oil relocation kit.

Any ideas why I might be fluctuating so much? I dont see any major leaks and my oil dip stick is showing that oil level is at high once the car has been sitting and completely cool.

 

Id verify that the gauge is working properly first

 

When I was having oil fluctuations it turned out to be a piece of FOD in the oil feed line for the turbo. I would check your lines to make sure they are clear. Otherwise you may end up having a fried turbo like me.