My bike had no speedo. I picked up a used drag specialties unit and the OEM drive gear. As far as I can tell it says I'm going twice as fast as I really am. Drag Specialties makes a 2240:60, 2:1, 1:1 gauge .....so to start with does anyone know the stock ratio of a 76 sporster with a 19" front wheel. That way I have at least a 50/50 shot at buying the next one.