Fuel, ignition etc is controlled by the The Autronic SM4 (electronic control unit=ecu). To enter the Autronic you have to connect it to your PC, with a serial cable. I thought it would be nice if I made it wireless. I bought a serial to blue-tooth converter, so I would be able to make contact with the Autronic wireless via blue Tooth.
As this is not made especially for the Autronic, making it work is a drama! I spent already several evenings and a great part of today to try to make it work. No way, not working yet. This is frustrating and time consuming. But in the end it will work, I am convinced. But it will cost lots of time.