how to wire inn tach adapter

Was wondering if any of you guys had any schmatics of how to wire up a tach adapter... I found a brand new mopar performance tach adapter in bottom of my tool box, and i have yet to wire in my aftermarket rpm gauage, wich i need to do soon.
Just figued i'd use this tach adapter since i have it, and i heard they help give a more acccurate reading and less interference noise....