The type of current produced in the sensor circuits of the speedometer and tachometer are?

The type of current produced in the sensor circuits of the speedometer and tachometer is typically an alternating current (AC) or a pulsed signal, depending on the design of the sensors used. Speedometers often utilize a magnetic pickup that generates AC signals proportional to the vehicle's speed, while tachometers may use similar principles to measure engine RPM. These signals are then processed and converted into readable information for the driver.