What are the main components of an electronic governor?

The correct choice identifies the primary components of an electronic governor, which typically include a magnetic pickup, an electronic control unit (ECU), and an actuator.

The magnetic pickup is crucial for sensing the engine's speed and providing feedback to the electronic control unit. This unit processes the information it receives and is responsible for controlling the governor’s response to changes in operating conditions. The actuator then adjusts the throttle to maintain the desired engine speed based on the commands from the ECU, ensuring optimal performance and efficiency.

In contrast, the other options list components that do not directly pertain to the function of an electronic governor. For example, throttle levers and fuel pumps are more related to general engine operation rather than specifically to governing engine speed. Similarly, camshafts and governor weights are components of mechanical governors rather than electronic governors, and controller modules or fuel lines pertain to broader system functions that do not specifically define the electronic governor's operational makeup.