ON MY 06' DIESEL MY TACH RANDOMLY STICKS AT 3000 RPM, AT IDLE AND CLIMBS FROM THERE AS I DRIVE, GOING TO FAR AROUND THAT IT HITS MY TURBO PSI GUAGE, IF I UNPLUGE THE GRAY CABLE PLUG FROM THE TOP OF THE CLUSTER AND PLUG IT BACK IT, IT RESETS AND IAM OK FOR A WHILE, AND NOW THE SPEEDOMETER DID THE SAME YESTERDAY AS I WAS DRIVING ON THE FREEWAY. WHEN I EXITED, I WAS STILL SHOWING 30 MPH. AND IT CLIMBED FROM THERE AS I DRIVE SHOWING THAT I WAS GOING 100 WHEN I THINK I WAS ONLY GOING 65-75 AGAIN IF I UNPLUG THE GRAY CLUSTER CABLE, IT RESETS. ANYONE KNOW WHAT THIS PROBLEM IS? IS IT COMMON?