Tachometer Questions

Okay I have completed the Heater core swap on my mustang.... I am now putting the interior pieces back together. While I have some of the cowlings all pealed off I wanted to hook the tach up to my dodge system. I have looked in my Haynes and Chilton’s Manual and they have nothing listed for which wire does what!
I need to know what wire is the tach signal feed color and location. I need to get that hooked up so I can now see my rpms... psssh who needs that right.... lol... Well any responses are greatly appreciated.
 
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