What exactly is the Rev counter in the car measuring?

Question:
I used to think it was the number of times per minute that the prop shaft rotates, but then i thought it could be the number of revolutions of the gear engaged; my dad tells me it is the number of times the distributor high tension fires. so what does the rev counter measure??

Answers:

I just failed my driving testttttttttttt?

The revoloutions of the engine

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Engine revolutions.

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they show the rate of rotation of the engine's crankshaft by measuring the spark rate of the ignition system,

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The "rev" counter or tachometer measures the revolution speed of the crankshaft.

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It measures the engine crankshaft revolutions. But the pickoff for the sensor can well be part of the distributor system, which runs at half the crankshaft speed.

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Engine crankshaft speed in revolutions per minute, before the transmission and regardless of gear position.

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If your question is about the mechanics of how the crankshaft speed is measured, I don't know.

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Engine rotational speed in rpm (revolutions per minute). Not connected with the gears or transmission, hence the rev counter operating whenever the engine's running, in gear or out of it.

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In the "good old days" rev counters were operated mechanically, often off the camshaft, but nowadays they are electronic and get their signal usually from a source within the ignition system. So dad's got the idea!

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Crankshaft revolutions.

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revolutions per miles

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it measures the number of times the engine is turning per minute

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you dad is correct(ish)

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It measures the number of times the engine's crankshaft rotates per minute.

I just want to know?

The number of times the engine crank shaft terns a full circle, i hope this helps .