How to link items
On the console, find the telepathic circuit and right click it with the linkable item.
How come my sonic isn’t linking?
For the sonic screwdriver specifically, you will need to insert it into the sonic port for it to link properly.
Any useful commands?
Certainly! the command to link different linkable items (like the sonic/keys/Stattenheim remote (which is a creative only item)) its:
/ait link
And that should link your currently held item.