Thanks guys......Denny that makes sense and I always thought that if you figured out which of the 3 ratios the gearbox had, you could match it by fitting the correct speedo drive. I thought they are 11,12 and 13 tooth to match the ratios.......but now I am wondering if that is too simple. Looks like the speedometer drive gears are perhaps a bit different depending on what vintage gearbox they came out of.
