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Glow plugs are like heaters. They do not pulse or provide any indication of RPM. They don't even stay on the whole time the engine is running. I can't imagine any way to monitor RPM short of the crank or cam sensors. Or some sort of output sensor.
 

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Glow plugs are like heaters. They do not pulse or provide any indication of RPM. They don't even stay on the whole time the engine is running. I can't imagine any way to monitor RPM short of the crank or cam sensors. Or some sort of output sensor.
Maybe reading it off the OBD2 port or something?
 
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