How to find the id-code for any gadget
"gadget", "widget", and even "page-element" all mean the same thing. I generally use "gadget", because the Page Elements tab currently says "Add a Gadget". But they're absolutely the same.Add the gadget to your blog in the usual way.
Edit it again, but don't make any changes to it.
Maximise the window, so you can see the very end of the address bar in the window - at the top of the screen.
Notice the word at the very end of the address, ending in a number. This is the Gadget-id.
In this example, it's Text1, Other possible values are HTML1, Attribution1, Followers1, etc.