[Elecraft] PAN Adaptor interface question

[goldtr8 at charter.net]

I think that I need to add KXV3a to my K3 if I want to connect a PAN 
adaptor or P3 of some sort.   So do I have the right item identified.

Currently I do not have that option installed.  It seems a low cost item 
but the bigger question is what is a reasonable amout of time required 
to install it.

I have a K3 100w version with no sub receiver.

Thanks

~73
Don
KD8NNU