gnome-shell-extension-appindicator : Adds AppIndicator support to gnome shell ( https://github.com/ubuntu/gnome-shell-extension-appindicator )
gnome-shell-system-monitor-applet : An extension for displaying sensors information in GNOME Shell ( https://github.com/mgalgs/gnome-shell-system-monitor-applet )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a 4nykey
For Paludis use this rsync : rsync://gentoo.zugaina.org/4nykey-portage
If you have a problem : ycarus(-at-)zugaina.org