Final answer:
The two major components of a supervisory electronics engine control are the supervisory unit and the engine control unit (ECU).
Step-by-step explanation:
The two major components of a supervisory electronics engine control system are the supervisory unit and the engine control unit (ECU).
The supervisory unit is responsible for monitoring various parameters of the engine, such as temperature, pressure, and speed, and making decisions based on this information.
The engine control unit (ECU) receives signals from the supervisory unit and controls the operation of the engine components, such as fuel injection, ignition timing, and exhaust gas recirculation.