2 layers82.6 × 50.2 mm

MagicQuartz Mega
sebmate/MagicQuartz-TechDemo
Turntable speedbox implementation for the MagicQuartz firmware
33 parts2
KiCad boards from 2 GitHub repositories tagged “speed”, the most starred first; open any of them in PCBKit.

sebmate/MagicQuartz-TechDemo
Turntable speedbox implementation for the MagicQuartz firmware

clovisf/bycicle-speedometer-v2
A bycicle speedometer with ESP8266 and reed sensor