My speedo is stuck at 30 and won't shift down no matter how many times ignition is reset. It goes up, so that is OK as you have to deduct 30, but it is annoying and Stack and Lotus had a big fallling out so neither will offer any help to sort it as I understand it. Units for the S2 do fit the S1 I hear, although not made by Stack. Suspect that would be costly though.