[Elecraft] What autotuner to use with KPA500?

[AC6JA at aol.com]

Just wondering what most people are using with their KPA500's until the  
KAT500 becomes available?
And how are you interfacing the tuner with the KPA500/K3 combination?
Was wondering if/how the LDG 600W or 1KW tuners would work with the  
K3/KPA500 and if the One-Touch-Tune feature could be used?
Any info would be appreciated.
Thanks.

Mike  AC6JA