Ammeter bypass

I am doing an ammeter bypass and 1 wire alternator update. I’ve been looking at the MAD diagram and I’ve searched some threads here but I’m not getting it.

It’s a 73 Duster. I can’t figure out what terminal to drill out of the bulkhead connector, and if I’m supposed to eliminate the black charge wire form the alternator at the bulkhead and what the MAD guy is talking about splicing into that wire.

I’m close to selling the car over this upgrade. The car isn’t worth it. Unless someone can simplify this, it’s going on the block and sold as is.

I’m sick of trying to decipher the myriad of ways it can be done, and no one ever shows exactly what wire to remove from the bulkhead connector.

I’m frustrated. Nothing is worth this crap.

TIA for any help.