Ok, first run sensors-detect on the console nad see if you get anything. if not sure what you are looking at, post the output here so we can see it. Look at my output, about 6 posts above as a reference. If you do get the output you are looking for, then you already have what you need to move to the next step. The reason it tells you to try it first is because other packages may have already installed perl or one of the other packages that will allow senors ro work.
If you don't get the output you want, then simple locate the plugin on your boot (flash) drive and use Notepad++ to change the one line - replace don't install with do install. Save and reboot. Go back to step 6 and run sensors-detect again. If it now works, go to step 7.
you use Notepadd++ as any other TEXT file editor. Just open Notepad++ and then open the plugin file, then scroll down until you find the line mentioned in step 6 and change it - save it and exit. Reboot and see if it works.