Speedometer gear Question

total tire diameter is what your looking for (i.e. 26", 26.5" etc) as well as gear ratio. if the needle bounces around during low speed operation but steadys out at higher speed, it usually is a bad cable. if it is bouncy all the time thru all speeds its in the gears in the speedometer, not the trans. the trans speedo gear only job is to properly tell the speedo what actual speed is.