The past few weeks it's been pretty cold in the mornings, between 25 and 35 degrees, this past week. I also park on about a 50 degree slope, which I don't know if it has anything to do with or not. Anyway, when I start up the truck on these cold mornings, the oil pressure needle doesn't move at all immediately. The check gage light is even on when this happens. Once I get on level land and the engine warms up a few minutes later, the needle jumps to the middle of the gauge where it should be. Just letting you know that you're not the only one, but can't be of much help.