Is there a way to add the small generator to the list?

Not at this time. It would take some coding to get the I/O entities working since storage monitors don't work on any of them in vanilla. Might not even be feasible, not sure.

Thank you for your reply. I did try to add it to the .cs and .json file so now I know why that didnt work. I was able to find a different solution to accomplish fuel monitoring with an industrial plugin.