title: OBDII - determine gear given speed and RPM
body: <p>I'm developing an Android application where we use the OBDII to read car's engine parameters. Currently we are obtaining speed (kmh), engine's RPM and mass airflow live while driving the car.
  We now have to find a way how using these parameters we are able to obtain from OBDII determine which gear is set at the moment.
  I thought about just specifying that for instance given RPM level and given speed the car is driving on a particular gear, but I thing it will not do the trick. </p>
  
  <p>Maybe some of you have some experience in such a field - I will be very helpful for any help!</p>