If you're in the somewhat unlikely predicament of having a car with no tachometer but you do have an oscilloscope handy, this hack is for you. I'm actually in that situation, but my 'scope is so old I'm not sure if I can make this work. Even so, it's pretty fascinating.
Jalopnik · Jason Torchinsky
Watch This Lucky, Lucky Idiot Get Flung From His Jeep And Walk Away
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