The steps required are below:
1) Using synaptic or the terminal, install ‘xfce4-xfapplet-plugin’ (which allows Gnome panel applets to run on the XFCE panel).
2) Install ‘sensors-applet’ (which is the Gnome monitoring applet)
3) Install ‘lm-sensors’ (which is the actual sensor monitoring software)
3.1) Open a terminal window and execute the following command: ‘sudo sensors-detect’.
This will guide you through the process of detecting sensors and adding kernel modules to monitor them. I answered YES to all the questions and allowed the script to automatically add the modules at startup. Alternately, these can be added manually.
4) Reboot (or manually start the kernel modules just identified by the sensors-detect script).
5) Once back on the desktop, right-click the panel and select ‘add new item’, and add ‘XfApplet’.
5.1) XfApplet (the Gnome applet software) will present any Gnome panel applets it detects. Select ‘Hardware Sensors Monitor’.
6) Monitor is now on the panel. Right-click and select ‘preferences’ to customize as desired.
And that’s all there is to it.