Hello, I was just trying to use vehicle respawn and it works for me.

1. Place empty vehicle (-s)
2. Place vehicle respawn module
3. Right click on either module or vehicle and select Sync connection type (under connection menu entry)
4. Click on other item.

You should see sync line between them and when vehicle will be destroyed in game it should get respawned on it's original position.

Thank you! Ive already do this and its work!
This happend with my mind because in 2D Editor there was a "link" instrument Button, which do a line between a vehicle and a marker, like a "Group" instrument (Ctrl in 3D)

You are welcome ;-)
Let us know in case of some other problem :)