Normally the tailwheel is connected to the rudder in some manner. I prefer to use [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXFV47&P=ML]Sullivan tailwheel assemblies[/link] as they isolate the tailwheel from the rudder by a spring. Look at the attached pictures and you can see how this is normally setup. If you have a plane that you can't connect the tailwheel to the rudder directly you will more than likely have to run a seperate pushrod from the rudder servo to the tailwheel.

Ken