Need help with FM-2033 mobile 2m rig
 

I have a KDK FM-2033 mobile rig that I just got. I need to know how to set
the PL tone. Upon opening the case I can see the tone board. There is a pot
next to it labeled "tone" as well as a pot on the underside of the tone
board itself.
Which pot do I use?
How do I tell what the current frequency _is?_

I hope someone can help me...
-Greg Courville