Turboclonerider

I am trying to make a program that will output a redstone signal to a light grey cable (from project red) so i can get enhanced portals 3 to activate a portal, but i can't get the redstone to work and i prefer using the computer. (uploading screenshots wouldn't work) error: /home/initialization:4: attempt to index field 'redstone' (a nil value): stack traceback: /home/initialization:4: in main chunk [C]: in function 'xpcall' machine:751: in function 'xpcall' /lib/process.lua:78: in function </lib/process.lua:71> stack traceba

Also, is there a way to make the text bigger?

My program is for a rail tour system, basically i have it where the redstone will activate or deactivate from one computer, but i wanted a second one to display either activated or deactivated.