The oil pressure gauge went out first. the fuel gauge followed. The speed odometer was also acting strange starting at 45 instead of 0. I disconnected the battery for a few minutes, that seemed to take care of that.
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It will change as you drive.....more force means more pressure.....HOWEVER Chevy and GM have had problems with gauges acting weird for years....I have worked for GM for years and have seen same problem with very many !!.....I wouldnt worry if you are sitting still and it jumps for no reason the gauge is faulty like most of the other ones.......If you know the vehicle has been serviced properly do not worry.....Or take to dealer and have it checked with a scanner....ALL GAUGES.
You might want to use a oil pressure test gauge and verify the actual oil pressure. You would connect it to where the sending unit screws into the engine. It's on the driver side back of the motor, under the distributor area. by the fuel lines.
There are motors that move each gauge inside your dash called jumper motors. They go bad all the time in your year of car. There are companies that you can send your gauge cluster to and they will replace all of the motors for around 150 dollars. Or you can buy some on eBay and soder them in yourself.
GMC yukons are notorious for gauge malfunctions, there are recalls for some models
However, if you have recently changed your battery this problem can occur and will take some driving time 30 min-60 min for the computer to fully reset.