Hello there,
I had a problem with my 2000 2.0 JTD with the temperature gauge not working. I bought an ELM327 bluetooth adapter and downloaded Torque Lite software for my phone and used that with an old phone for the gauge. I also set it to give me a rev counter, gps speedometer and ecu speedometer which worked really well. If all you want is to know the speed that will give you it.
I could tell you by private message which adapter I bought if you wish (so long as that doesn't break forum rules?).
I don't know if that helps you but I hope so.
Cheers,
Richard.