Just took out my new 2010 Supra 2010 SSV. We have a problem with the speedometer. It fluctuates greatly... up to +/- 20 miles per hour. This is causing the perfect pass to not work correctly. When the speedo indicates the speed is slow the engine revs up and when the speedo indicates too fast the engine backs off almost to idle. This condition continues and makes using the cruise worthless. Has anybody seen a similar issue? If so, what was the cause. Obviously I'll be taking back to the dealer for warranty repair but any information would be appreciated.