I just did a similar thing on my ajax page (added pool sensor), mine is VWS, but the principles are the same. The base version of the ajax scripts does not have any "extra" temp sensors parsed out of clientraw (or in my case the wflash files....
So first you would need to edit your
ajaxWDwx.js
Add a section, near the //temperature entry like this....
//Soil Temperature ...
soiltemp = clientraw[20];
set_ajax_obs("ajaxsoiltemp",soiltemp);
Extra soil sensors are listed as 20 through 25, used the parser script at TNetweather to figure that out. So once you figure out which one is your soil sensor use that, in place of the "20"
http://www.tnetweather.com/wd-parser.phpThen you would need to put an ajax tag "ajaxsoiltemp" in your page you want it displayed.
<span class="ajax" id="ajaxsoiltemp"> </span>
Anyway, that is my stab at it, Ken will probably comment. Hope I am close (and as usual, backup your js file, etc before attmepting.
Andrew