I know the 03+ gauge clusters commonly have issues and issues are pretty common. You can probably group the 99-02 trucks in there as well. My gas gauge crapped out on my gauge cluster about 3,000 miles ago. GM has had a recall on the gauges if your truck is 70,000 miles or less (mine has 76k :no for awhile now. If you are over 70,000 miles, you can find cluster repair services on ebay or craigslist for around $60-$80.
To hoosyurdaddy: The 99-02 trucks were not known to common failures like the 03-07 classics were, and when those ones failed, they usually just pegged out somewhere random and stuck there. As your gauges are still moving, they likely aren't 'dying', but if you have more than one of them fluttering and your temperature reading high (have you confirmed that the gauge is reading higher than actual temp?), it seems like something in your cluster might be going bad, although it doesnt seem like the motors themselves.
I have also had one gauge recently start to flutter, but I believe mine is dependant on a separate condition. My oil pressure gauge will flutter all over its normal range, but only when the engine is running between 1300 and 1500 rpm.
At this point, it seems like all your gauges still move and work, and are fairly accurate, so I wouldn't be too concerned about this yet.
My Cluster went out around a year ago (03' Yukon). First oil then, battery, speed and fuel. Plus a bulb blown. Went to the dealer and was quoted $800. Found a person on ebay that fix clusters (new motors, bulbs, clean) for around $60.00. Have been going strong ever since. Send me a PM if you want his info.
Any ideas? My gas guage has been fluttering for a while now. (close enough for gov't work)
Now my volt guage is jumpy (putting on signals will cause the guage to jump with flasher)
My temperature guage gets up to "normal" and stays there. Even when I'm towing a lot of weight. So either my cooling system is excellent or my guage can't read past 195.
Now I'm wondering if it's time to address it, or continue to ignore it.
That sounds like a bad contact somwhere, even if you have an excellent cooling system, it should still read normal tempurature, depending on how hot or cold it is outside, when its hot outside my temp gauge reads between 180-195 and when its cold its between 155-175. But my oil pressure gauge goes absolutely wacko when I am idling at a light or stopped, soon as I hit the gas it shoots up to 60-65 and its steady...So I dont know what the hell is going on with that..would like to figure it out, all the rest of my gauges read awesome, except my gas gauge which is always on freakin E, but thats my fault lol..
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