Freon is forked from gnome-shell-extension-freon. Freon is an extension for displaying CPU temperature, disk temperature, video card temperature (NVIDIA/Catalyst/AMDGPU/Bumblebee&NVIDIA), voltage and fan RPM in GNOME Shell.
This fork of Freon includes support for showing AMDGPU temperatures also.
git clone https://github.com/Veske/gnome-shell-extension-freon
cd gnome-shell-extension-freon
mkdir -p ~/.local/share/gnome-shell/extensions
cp -r freon@Veske ~/.local/share/gnome-shell/extensions/.
restart GNOME Shell (Alt+F2, r, Enter) and enable the extension through gnome-tweak-tool.