The simple answer is maybe.
Case 1) You have thin wires going to the ammeter. They lead back to a "Shunt." The shunt has heavy wires on both sides. You can:
a) Just disconnect the wires going to the ammeter or
b) Remove both the ammeter wires and the shunt by hooking the wires on each side of the shunt to each other.
Case 2) (Internal Shunt) You have very heavy wires going to the ammeter. Simply hook them together.
Fair winds and following seas