Sushil Siddesh wrote:
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this might be off topic.

Is it possible to measure the engine RPM of a vehical by tapping the frequency of the alternator which supplies the electrical power??

Yes. And i think that is the metod used by most diesel cars.
I think that there is an additonal "pulse cable" in all modern alternators for doing this feature and adjustments in the motor.

However all "i think" are because i don´t checked this.