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Originally Posted by MikeK
How does it know the engine RPM? I didn't notice any other sensors being connected up (not that I could see much from outside of course)
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It's usually monitored via a timing light on the crank pulley, or can be monitored by plugging something into the car's electrical circuit (the cig. lighter will do) and counting ignition pulses (on our cars, every 4 pulses is one revolution).