I wondered if more experienced members could help me triage this issue based on the following symptoms:
- Speedometer is calibrated well and works as expected up to around 80mph
- At, and above, 80mph the needle falls to 0.
- When speeds return below 80mph the needle kicks back into life and reads accurately again.
I'm completely new to this side of car ownership so even some basic areas to look at or tests to run would be much appreciated!