2007 Hyundai Sonata Q&A

2007 Hyundai Sonata Question: I have a 2007 Hyundai Sonata. Whatwould cause the gauges to rapidly fluctuate.

Both my spedometer and rpms will flucuate up and down with out any change to my speed or rpms. my spedometer will fluctuate 10 to 20 mph at a time. It seems to do it the most when engine has not reached opperatting temperature yet. Any ideas? -
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