Cant remember where I saw some people talking about it but heres a link to make your own .
http://www.massystems.com/TD-Mod.html
http://www.massystems.com/TD-Mod.html
I saw some back in the day and they had less components than this one and worked fine.
As far as I know theres no territory switch Its just a matter of changing the connectors to different places
I dont see why it work one way but not the other