Safest way would be to buy a Tenor string set tuned to DGBE.
Aquila have a set. I have it on my Tenor. It's not great acoustically, so I mostly use it plugged in.
Here is an example... http://www.youtube.com/watch?v=APSrC5zM-cs I use heavier strings than tenors. Guitar strings work well. Need some tesion for good quality sound...