Fusible link melted!

Question, do you have to bypass the ammeter in the above drawing? Could you do everything but bypass it? Seems like if you are not adding anything to the underdash load just leaving in place would be fine. You still get both wires sharing the underdash load and any extra big loads could just be added to the starter relay or battery post. If you don't bypass it what would it read? nothing? I just re-did my dash and don't want to pull it our again, I have my whole forward harness out and am re-doing what looks bad there.