Hello, my speedo/ clocks have stopped working correctly when my battery died while we were away.

I have managed to get a second hand cluster but these  show the incorrect mileage for my car,

Can anyone recommend somewhere I can have the correct mileage fitted onto the second hand unit.

 

Many thanks.

is the mileage not stored in the ECU? 

I don't think it is. I think that's why the breakers always state the mileage figure when they sell a dash cluster.