The Expert pro 1200A/50mV Shunt kit, can be used in applications where the battery current would exceed the maximum ratings of the standard supplied 500A shunt.
After installing the 1200A/50mV shunt, the only thing left to do is to set the Expert Pro (-hv) Function settings F6.1 and F6.2 to respectively 1200 Amps and 50 mV.