Bypassing the Amp gauge - Question about the MAD Electrical method

The red wire DOES NOT touch the welded splice, diagram A is a PIA to perform. Unless you want to peel apart the harness to attach a wire to the splice, waste of time and effort. The welded splice is in the black wire run. The easy way to do a one wire approach is to connect ammeter wires red/blk and run a single wire to the red, terminate black wire before bulkhead to keep from shorting anywhere.

Much easier to leave the OEM stuff alone and run the charge wire from alt stud to starter relay.

Pick which way you want to do it and go.