Okay, I guess a lot of people might want to use Fink to install gv, so I've added /sw/bin to the path in the script. However, if that were the only problem, you ought to get an error dialog from my script. I guess the reason nothing happened at all is that you didn't set the executable bit on the script.
I attach a new version (1.2) which ought to solve these problems. If it still doesn't work, then go into the Bundle Editor, click on the watch command, and change "Output: Discard" to "Output: Create New Document". Then try it again — you should then get a document containing relevant error messages.
Thanks for testing!
Robin