We've already seen the 1000 MPH Rolex built for the Bloodhound SSC land speed record hopeful. Now, driver Andy Green explains exactly why he needs it.
Basically, if there's a catastrophic failure of some kind and all the electronics go out, that Rolex speedo and clock/stopwatch run on their own power. They'll be what Green uses to bring the LSR vehicle to a stop. The speedo has its own GPS, even.
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It's easy to make jokes about watches being redundant, but when you're looking to break 1000 mph, sometimes redundancy is exactly what you need.