As I was unable to find any 'how to wire..' help with any ease, here it is for those that might ask how it's done and how to wire up that first time volume control.
Be sure to leave ample wire in your setup for the knob to not only reach your cab wall, CP or where ever you are installing it, but also to give you lots of room to repair or replace burnt out parts.
The potentiometer works like a volume control on a radio.
1. Simply ground one of the outer pins (usually left tab if the 'rod' is facing you).
2. The other outer pin goes to output
3. and the center pin to the input.
NOTE: The direction of the knob ‘turn’ is the direction you should set the output wire. Input on center tab and Output on right tab will result in volume increase on a clockwise turn, decrease on a counter-clockwise turn.