Software for a GameBoyAdvance (GBA) to communicate with the on board engine computer on VW/Audi cars a screen shot of the current version is displayed below.   Turns the Gameboy into a virtual Gauge ( OBD Gauge).     

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  The GBA(Gameboy Advance)  is used to talk to the ECU (Electronic Management Computer) to display allsorts of information not available from the instrument cluster MAF (Mass Air Flow), Engine timing, Air temperatures etc. This is handy when looking at  faults as you are seeing  the values that the ECU is using to work out engine settings.