i may have made a post about it before, but does anyone know why my speedo would be out by 50%? its been like this ever since i blew up my original 25DE gearbox and put a 25DET gearbox in its place. and yeah basically speedo reads half of what it should. was just thinking about it then, iv learnt to live with it but it would be nice to have it accurate. anyone know what may cause this and what the best way is to fix it? car was a non-turbo at the start of its life, since done DET conversion and bits and peices.