amp gauge

I saw the MAD electrical diagrams in a past thread and looked at them. I like the idea of having all of the current out from under the dash and contained in the engine bay. All that I want to do is have a worry free set up so if the gauge goes to crap or shorts out I don't have a wiring meltdown. Correct me if i am wrong but all that has to be done is splice the red and black wires together under the dash, and splice them in the engine bay with a fusible link to the starter relay. And send the current from the alternator to the starter relay. I didn't like how they drilled out the bulkhead connector, so could I just leave the red and black wires in the bulkhead? Does the Mad electrical solution even reduce the chance of something happening or is it a waste of time
It eliminates the overloaded spade terminals and the possibility of a gauge failure killing the power. This type of repair is about all you can do without getting into a major rework.