How to fix a faulty speedometer in an Audi 80?

My Audi 80's speedometer has suddenly stopped working. It doesn't display any speed and the needle is stuck at zero. What could be the cause of this and how can I fix it?

Hi Sophia, a faulty speedometer in an Audi 80 can be caused by a number of things. It could be a problem with the speed sensor, wiring, or even the instrument cluster itself. The first thing you should do is check the speed sensor and make sure it's connected properly. If that doesn't solve the issue, you may need to replace the speed sensor or have a mechanic check the wiring and instrument cluster.