All of these things will need the appropriate software written at the empeg end, which is outside my remit However, I'd guess that once some hardware became available, one or more programmers would stand out and be counted.

Speed input could be done via one of the digital inputs reading the appropriate line into the ecu on most cars.

What exactly is the format of OBDII? If, as I think, it's a form of serial data, the digital inputs could be used along with the appropriate software.

pca