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?
I have a 2007 Hyundai Sonata. Whatwould cause the gauges to rapidly fluctuate. on 2007 Hyundai Sonata