06 Rio5 Speedo and Odometer not working

My mechanic thinks it's the intrument cluster because when hooked up to his scan tool it getting the speed from the speed sensor. I read a post online that someone said for an 2007 rio5 there is a speed sensor on the right wheel that sends info to the OBD and another sensor on the transaxle that sends info to the Odometer/Speedometer. Does anyone know if this is true and if it also applies to my 06? Car is an automatic.