Battery draining overnight

This is the alternator I have. Some people say that to use this I have to bypass the ammeter by moving both ammeter wires to a single post on the back of it, then just run an 8 gauge wire from the alternator to battery. I kind of wanted to keep to ammeter working but I’d rather not buy another alternator.
Powermaster Retro Alternators 75191

Rather than rely on "some people" I would call Powermaster and see how they say to wire it. Did it not come with deestruckshuns?