I have been searching around for my exact problems, and I can't find a direct answer where to go from here!!!
I was driving to the bank when i noticed that my Check engine oil pressure light came on, looked at my gauge and it read 0. Had it towed home in fear of burning up the engine.. Got it in the garage and made sure i was still pumping oil, took the oil feed line to the turbo off and fired up engine, and nothing came out!!! checked sensor plugs and everything checks out!!! Also when i turn the truck off the gauge goes up to about 25???? when all the other needls are at 0...
WHAT NOW?????

01 Stock GMC Sierra BTW...