Won't fire

Damn it!!!! So I was switching all my aftermarket gauges and cluster in to the car and as I disconnected the factory alt. gauge the hot wire came in contact with the dash and smoked the fusible link literally . I have another one from my other car but it went thru bulkhead so do I need to change that whole section or just the one wire??

Yes I made the rookie move of not disconnecting the battery. Uughhh.