The speedometer in the DeLorean time machine was altered alongside the rating of the vehicle's engine to allow the time machine to reach a higher speed; in the case of time travel, 88 miles per hour needed to be reached. Initially, the DeLorean had a top speed of roughly 75 mph.
A digital speedometer was also used in synchronization with the analog speedometer to allow the driver to measure the speed exactly.
By 1985, due to "soft" metric conversion in America in the early 1980s, the speedometer also displayed kilometers per hour (km/h) in smaller figures.
- All appearances of the DeLorean time machine