fried fusable link

Ok, well then.
You know the type of connector, one that is inline and has a fuse holder.
Butt spice it in temp.
(I have run them permanently in cars).
Anyway if your fuseable link is 30 amps (for instance), just don't put a 50 amp fuse in.
Off the top of my head, I would guess the circuit goes from the link to the amp meter and then to the fuse box. Spliting there to unfused circuits, like your ignition switch and fused circuits like your head lights. But I'm not sure. I rely on prints a lot because of a bad memory.