Hi I'm on the lookout for a speedometer for my 1949 M20 which has a gearbox driven speedo drive fitted, Does anyone know what the ratio is on this please as I don't want to order the wrong one ?
Thanks Dave
The Smiths chronometric speedos were listed under a face number not ratio. Only the tachometers had a ratio given.
Below from a BSA parts bulletin issued in 1955 gives the M20 face numbers.