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I had to solder wires to the speedometer transistor board that's inside the little aluminum box located by the clutch master cylinder. How do the electronics work with the spinning speedo cable anyway?
 

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But Mad North-Northwest
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11,640 Posts
It's a pulse generator. It sends a square wave voltage signal to the speedometer.

I'm not sure if it's a hall effect sensor or an inductive sensor, but if you google those you can see how they work.
 
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