Oil pressure gauge playing tricks on me?
 

I was out cruising around last night and just happened to look down at my oil pressure gauge and it was just above 0. Needless to say I freaked out a little bit. I was about 5 miles from the house and the truck was driving and behaving as it normally does. I made it home and checked under the hood, there wasn't any evidence of oil anywhere and it was idling fine with no noise or anything. Turned the truck off and restarted it and whaddaya know the gauge jumps up to normal...punched it a few times in the driveway and the gauge was behaving like normal. Researched a little bit online and I saw that there was apparently a TSB issued on this for the 2004 silvys and looks like a pretty common problem. Anyone ever run into this before or should I be worried about bigger problems?

Replace the oil pressure sending unit. It's a quick, cheap, and easy fix/diagnose.

My 04 Sierra did the same thing and the speedometer was erratic. I got a new instrument panel/cluster. GM paid for it because I was within the mileage and time limits.

my 04 silvy just did the same thing. alarms went off and every thing. no valvetrain noise oil level fine and all. this just after putting in a 6.0 this weekend. is this typical?

Most likely a dead cluster. Been seeing quite a few of the the 2002-2005 go through the shop lately.

well, it will scare the poop out of you if it comes on out of the blue. luckily i tapped the blockoff for upcoming turbo install so i can check it mechanically if it happens again. is there a real fix for this?

Sometimes it the oil pressure sending unit but most of the time its the gauges themselves. You can send them to this guy. He repairs it for cheap with a lifetime warranty and can do LED conversions in almost any color.

GM Gauge Cluster Repair and L.E.D Conversion with LIFETIME Warranty

i had it do it to me on a 2003 chevy, my speedo, oilpressure, and volt guage where going crazy i was the third owner with 115k on the truck and i took it to my local dealer that i didnt buy the truck off them though and i got a whole new guage cluster for the price of intsall, ended up being 50 bucks but if your truck has less than 80k on it its free is what the dealer told me, there is a recall on thos clusters. i live in oklahom also, hopefully thats just your problem, but it might be different on rst guages

I believe its under 7yrs old with under 70k miles

Bad stepper motors
 

I had the exact same issue but, my oil pressure needle point the extreme right! It would then go back to the correct position and then bounce all over the place. GM didnt' put in the top of the line stepper motors (one behind each gauge) so I went ahead and had my cluster rebuilt. Changing one stepper motor costs $90 and changing all 6 (with new bulbs and testing to make sure it was all copasetic) cost me $150. Worth every penny. I used Speed-O-Tach in Concord,Ca.