Creating an Automator app to start you shows from the desktop can make it much easier to run your P3D shows. No need to fire up Terminal and type in the start up commands, instead, just click on the app.
Creating the Automator App
Open Automator, you will find it in your Applications folder. When it opens a window will give you options for the type of Automator document you want to make, select Application.
The main Automator will now be visible.
From the lhs menu select Library, then in the middle menu scroll down to the Run Shell Script option and drag this into the workspace on the rhs.
Now, on the Run Shell Script window, change the Shell to tcsh, by clicking on the button that says /bin/bash and scroll down to the /bin/tcsh option.