[问题]有汽车行家吗?TACHO信号是什么?

I guess it is the signal that represents the rotating speed of car wheel.
the strength of the signal is displayed on the tachometer (zhuan3 su4 biao3) on the front panel of your car.
 
能描述一下TACHO信号的特征吗?
哪里有资料可以看啊?
多谢!
 
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