does it mean the overdrive is off or on when you see odo and where is the on off button for the odo?
above the milage i see odo, i am unsure if the overdrive is on or off and I can not find the button anywhere?
Odo stands for odometer, it has nothing to do with overdrive. As for whether it's on or off most cars with automatic transmissions just automatically use the overdrive without needing to turn it on or off. If that's not the case then there will be a button on the shift lever.