This is the latest update to the scale speedometer I created for HO scale trains. This includes a much smaller unit with two distinct types of sensors.
The parts list includes:
Rear Mounted sensors 1
Front Mounted sensor
.56 inch 4 digit display
Do not use these.. %22%2Caps%2C180&sr=8-4 If You ordered these you will need to get the adafruit backpack board.
Buck Regulator. (separate bridge rectifier needed)