67 Barracuda alternator with 2 FLD connections

Their website says it works with all multimeters. Been an electronic guy my whole life. Surprising I didn’t get one before now.
Just added some pics from instruction book to previous post.
If I understand correctly it can be read as voltage and then scaled to amps. When I used it their automotive meter, I could set it to show amps directly. I guess any meter with those mV/A channels built in would do the same.