Many won't roll back, but you can often put a drill on the speedo and roll it forward to the proper mileage.
You might plan to refuel when your fuel gauge reads one-eighth of a tank of gasoline. Some people choose to refuel when the gauge reads one-quarter of a tank remaining.
Head – The device that reads and writes the information—magnetic or optical—on the disk surface.
chip reader
news reader
drive
drive
Safety neutral switch
broadcaster and presenter
Rachel Green
In the drive mechanism the part that does this is the head assembly.
That would be a desktop scanner.