[Elecraft] K3 to KAT500

[tom armour]

If I buy a K3/100 without auto tuner and a KAT500 is there any additional cable I need (other than coax) to connect the two together? or does KAT500 come with all cable beeded to connect it to the K3?  I see a cable for KAT500 to KPA500 but not to the K3.
Is there anything I'll be missing with the KAT500 vs the internal tuner other than portability?  I hope to be able to make an order soon.
Thanks
73 - Tom - wa4ta