The button states could easily be read by using an Arduino’s analog input. A Pro Mini model was chosen for its small size as it could be housed in the radio compartment of the dash. The next ...
After all, the Arduino isn’t actually measuring the CPU speed, nor is it directly controlling it (that’s still done by the original Turbo button wiring). But the truth is, even back in the day ...
push buttons, and sensors, as well as jumper wires and solderless breadboards. You can buy these items separately from shops like Adafruit and SparkFun, but getting an Arduino starter kit is more ...