Angib, I don't have the obc - however the display should show the temperature and I thought mpg. The menu options allow me to change temp from F to C but no temperature is displayed and the the same applies to the MPG - I have the ability to change the fuel consumption settings from l/100km, mpg etc. but the mpg is not displayed - could ths be a software fault??
The manual also indicates that a range will be shown when low fuel is reached in the rev counter display - so I presume some computer must be present??