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Tachometer

"Tachometer, is there not one

"Tachometer, is there not one on the motor. what tell the gauge how many rpms the motor is running?"
 
I guess you mean the signal &#

I guess you mean the signal 'source' for your tacho.
The signal to the tach is taken from the yellow/gray wire from your rectifier.
 
"Double check with a manual/al

"Double check with a manual/alternate tach.
If your charging system is working, tach is set right (6) it should be close enough."
 
"Maybe the gauge is wrong, it

"Maybe the gauge is wrong, it moves as the rpms increase, but it showing to idle a 2000 rpms, and maxing out on the gauge at wide open throttle."
 
"If an original, check the set

"If an original, check the setting at the back.
take a small screwdriver and adjust to '6'. Wiggle a bit back and forth as indication may not be accurate."
 
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