Richard,
I don't know about the particular MFJ product but what are you trying 
to tune - the internal tuner in the Kenwood might well tune what you 
need.  If your antena is far enough out of resonance to need an 
external tuner it might be profitable to adjust it to where an 
external device isn't necessary.
Consider those thoughts and do what you think makes sense.
Good luck.
And of course, this is just my opinion.
Pat, K9JAUAt 02:02 PM 10/8/2014, you wrote:
>Hi!
>
>
>
>I am thinking about getting the MFJ 998 external auto antenna tuner
><https://www.hamcity.com/store/pc/MFJ-998-p293.htm>  together with the MFJ
>5114K interface cable <http://www.hamcity.com/store/pc/MFJ-5114K-p2127.htm>
>for my Kenwood TS-2000.  Supposedly, with this setup, 1) there is no need
>for a separate power supply and 2) the TS-2000 interfaces with the MFJ 998.
>
>
>
>Is this true?  Does the tune function operate by using the TS-2000's "tuner"
>button?  Are CW squawks heard if (and if not) a match is attained?
>Generally, is this basically a seamless integration with the TS-2000, and is
>this a "good" setup?
>
>
>
>73,
>
>Richard KK6MRH