I cannot get my 2 PlayStation 4s linked to play 7 Days to Die. I don't have internet and I'm trying not to use split screen. I have cables, but I'm not sure what to do with them.
For this game, if you want to play together and maintain separate screens, you'll need to play online. Otherwise, this game supports offline local co-op splitscreen. On Co-Optimus, it states under 7 Days to Die:
System link or LAN play is not supported.
Please see the complete list of co-op features at Co-Optimus here.