Does simply ignoring the computer count as a manual override?

In November 1983, a Colombian jumbo jet enroute from Paris to Bogotà was making a scheduled stop in Madrid. Landing in the dark, the crew made a mistake with the instrument landing system, turned on to an incorrect track and flew into a hill. An analysis of the cockpit voice recorder revealed that some minutes before the crash, an audible ground proximity warning system had told the crew, "Pull up! Pull up!"
The pilot replied "Shut up, gringo."

Those were his last words. All 20 crew and 161 of the 172 passengers were killed.

The sprockets that drive the odometer and speedometer are typically nylon. They don't bear much load and are well lubricated. They can wear or fail in a number of different circumstances. I had one replaced with one that had a different tooth count. Gave me great fuel economy as I was driving around at about 10mph less than I thought I was.

happy fathes day