I like to do the Ford remote starter relay also. OK, your motor is not modern. So you are doing a Resto-old I guess.
If you want to wire the ammeter. It gets one hot wire from the battery. They came from the starter stud because it was a nice place to get battery positive. All the loads are on the other ammeter terminal, including the alternator.


Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn