Yeah, having an accurate ammeter is a nice thing to have in a vehicle. Jeesh, the cars of olden days had good ammeters in them, how did we lose the track?
That 14 AWG fusible link thing has me worried. Are you drawing off power to the house battery before the fusible link? From the alternator directly, IIRC. Memory fails, occasionally.
Blue Seas may be selling the Marine version of those Bussman breakers. They are almost identical to the shore-used type but the contact studs are in front with little rubber booties. If that isn't the case, I'll take your word on it. Stranger things have happened in the Marine supply world.