ADDED DETAIL OF THE COMMODORE 64 CAR COMPUTER
I have written various programs for the Commodore 64 that display information on various parameters, such as speed, distance, acceleration, cornering forces, trip time, and estimated wheel horsepower. The computer gets this information from basic speed and acceleration sensors that I built.
This is the opening page when the main program is first ran:

From there, I can run one of several programs. The picture on the left is a general information screen that displays speed, acceleration, cornering forces, distance, and trip time. The picture on the right gives more detail about vehicle speed by graphing speed and acceleration over time:
In this next group, the picture on the left is a program that is designed for a track. It measures 0-30, 0-60, 1/8 mile, and 1/4 mile times. It also senses braking and automatically displays braking distance and time, as well as the speed the car was travelling when the brakes were applied. The picture on the right is a program that measures acceleration, deceleration, left cornering force, and right cornering force. It displays this information as a point on a graph, and it stores up to 200 of these measurements (along with speed and estimated wheel horsepower), which can be played back after stopping the car. These records can also be saved to disk: