Max-F-Helm / gnome-shell-extension-freon

Shows CPU temperature, disk temperature, video card temperature (NVIDIA/Catalyst/Bumblebee&NVIDIA), voltage and fan RPM

gnome-shell-extension-freon

Freon is forked from gnome-shell-extension-sensors. Freon is an extension for displaying CPU temperature, disk temperature, video card temperature (NVIDIA/Catalyst/Bumblebee&NVIDIA), voltage and fan RPM in GNOME Shell.

For more info, check out the Freon wiki.