Hey fellas I'm new to this group so bare with me lol. I have a 99 Yukon and as I was pulling up at home today I noticed that my check gauges light came on and it was because the oil pressure gauge was almost down to the last mark on the gauge. It's always running on good pressure but after it warms up good it does what all these trucks do and drops oil pressure some. So what should I do about this? Any and all help us much appreciated.