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You will probably also have to watch whether the tank has the speedo on it or not, along with what @crusader1xxx said. Otherwise, EFI tank can be replaced by another EFI tank, but if you try to change to a Touring tank, you might have other issues with gas cap, fuel pump, fuel gauge, etc., along with moving your speedo to the handlebars. As said before, it all depends on time, skills, and budget.
You've got a 5 gal tank now. I think HD has 6 gal tanks on touring. That's only 1 single measley gallon. To do all this for 1 gallon seems counter productive. Now, if someone/anyone made a 15 gallon tank, then that might be worth the expense incurred.
Now, if you're doing this just to tinker, then sounds great. Have at it!
I've seen guys add a second tank on their luggage racks to get nearly double the fuel capacity. You might consider that option instead. It would probably be cheaper, too.
Here's one example:
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