Another Ammeter bypass question

since it’s raining I’m lining up the next project. Read a ton of posts and a ton of different ways to do it. So correct me if I’m wrong. I’m looking for the easiest simple way. So.....
I have some welding cable (6gauge) that I’ll use for the bypass. Make the cable and run from alternator to large post of starter
Cut ammeter wires at bulkhead (under hood side) and connect.
Already have a voltmeter installed
Is that it? What am I missing ?