It shares the same Seeed Studio XIAO ESP32-C3 microcontroller, 0.49 inch OLED display, and tiny 40 mAh LiPo battery. The only thing that’s really changed, aside from the adjustments necessary ...

In short, the ESP32 needs to find the sensor ... The data is then converted to RPM and displayed on a small OLED display. [publidave] does an excellent job of describing what exactly he did ...