"My question is since I do not have the KPA and KTA connected to a K3 (it's a 
K'Wood TS-480), do I really need the aux cable between the KPA and KTA?"

Aux cable not required and would, to the best of my knowledge, do nothing in 
your configuration.   What you probably can do is have the KPA500 poll the 
TS-480 with IF, FA, and FB and have the KPA500 and KAT500 listen to the 
replies.  (I only say probably because I assume, but don't know, that the 
TS-480 supports IF, FA and FB responses.  It works for TS-590 and TS-890).   
Elecraft sell a serial cable for exactly this purpose.  Be aware though that 
KAT500 will only follow VFO A if you use this configuration.  KPA500 will 
follow the TX VFO regardless of whether that is A or B.

Sorry, but I have no experience with the power up pin.

73,
Andy, k3wyc
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