The trigger wheel rotates with engine RPMs and causes the speed sensor, or pickup oil, to produce triggering voltage pulses that correspond to engine speed and piston position.

触发叶轮随发动机转速而旋转，使得转速传感器或拾波线圈产生与发动机转速和活塞位置相对应的触发电压脉冲。

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And, along the way, this ad managed to position the 2013 Ram 1500 pickup truck as the preferred vehicle of a treasured and fast-disappearing way of life.

FORBES: Chrysler Scores Big -- Twice -- With Surprise Super Bowl Ads