It could have something to do with the heat of the bulbs. per mars commnets... the auto meter gauges use l.e.d.'s insead of "bulbs" i believe and l.e.d. run alot cooler than bulbs. I have (had?) the problem and just repalced (last night)the bulbs in my stock gagues with l.e.d from auto meter and it will be interesting to see if that takes care of the problem. time will tell.
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