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Need Help with a Stock Tachometer swap to Speed Hut Tachometer.


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Hello, I have a '70 240z that I upgraded all my gauges on.  I heard I needed to connect 2 of the 4 wires that feed the Tach together to make sure I complete the circuit when I replace it with a new (Speed Hut) gauge.  Does anyone have experience with this and can help identify what two wires in the wire harness I need to splice together?  

 

Thanks,

 

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