Since you don't have non stock amp draw items, the newer Alternator is OK. It will be OK, in my opinion to wire the ammeter. You are correct, you would not have a voltage reg with internally reg alt. SOoooooooooooooooooo keeping in mind AAW doesn't like ammeters and I don't either, I do understand that a stock look is best. Logic says if the ammeter was designed to read/handle loads in an original/stock truck, it will be OK. The alternator will only output what is necessary.
You WILL NOT find a way to install a volt gauge in the ammeter hole and have it look original or even good. unless you want to pay someone big bucks.
Look at pages 2 and 3 of instructions. Find the red wire from the mega fuse to the fuse panel. I believe the end at the fuse box is wired sort of permanent, so leave it terminated to fuse panel. You will cut it at the right place to do the following. Attach it to one terminal of the ammeter. Use the cut off piece for a wire from the other ammeter terminal to the Mega fuse. In other words, put the meter in series between the Mega fuse and the Fuse panel. Which terminal on the ammeter gets what wire you ask? If it's backwards, it will read backwards, then you switch wires.
It would be nice to test the gauge cluster before a tight "button up".
I actually like idiot lights for charge and oil.
Wire the other Mega Fuse wire as shown in the instructions. (starter to alt.).
Remove the alternator output wire from the mega fuse, install a fusible link inline and place it on the same ammeter terminal as the wire to the fuse panel mentioned above. In other words, the wire coming from the alternator now goes thru a fuse and on to the ammeter. FYI: The AAW diagram does not show the battery positive cable connected to the solenoid large stud. Which it would be.
I have modified the last sentence of my original suggestion. I have written ammeter wiring on several posts and don't know why I missed this last sentence. You will notice in my modified portion in red, I used the mega fuse for one circuit and a fusible link in another. Mark has two good diagrams for wiring. However, he shows the mega fuse split into two mega fuses. I do not know if that is possible or if it is built with the hot sides permanently connected. The AAW diagram shows they may be. So I mention one wire can use a fusible link just in case. As has been stated, both can use a fusible link and abandon the mega fuse. To reiterate, the battery hot goes to one ammeter terminal and all other wires, I.E. alternator output, fuse panel feed, goes to the other.
Fusible links are sized 4 gauges smaller than the gauge of the wire. Example: 12 ga wire gets a 16 ga Fusible link. They are just a piece of wire with extra burn protection insulation. The wire, or a coupling, burns in half before damage is done to a component.
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