Thank you for your answer. So, I have just to change my car by a modern one

I use Harry's laptimer with my young lady : a porsche 964 Carrera 4.
Unfortunately in 1990's, the OBD2 system was not use by Porsche. But I have find a converter from OBD1 to OBD2.
Harry, do you think that will work with your LapTimer App (iOS) with adding a ELM327 wifi interface ?