Could be instrument cluster , here is an example .
Peugeot 207 Cluster Repair. Dashboard / Instrument Cluster / Panel Failing /Speedometer Repair
Usually the back lighting starts flashing followed by total power failure as well as warning lights flashing. We replace the faulty parts with new more robust components.
The repair is carried out by fully qualified electronics engineers and your mileage reading will stay intact as we can retain the original data.
Flashing on and off
Rev Counter failing