The amp guage looks fine to me. Sitting idling, with nothing on, the amp guage may show a slight defelction towards the positive, or nothing. When starting, it should go to the negative side, then bounce to the positive side once it fires. Idling with all lights, heater blowers, etc on, may show a deflection to the negative. However, with the 50 amp guage and higher output alternator of an 81 2F, the defelctions may be pretty small. On my 73 with the smaller alternator, it moves quite a bit. I think the guage is labeled at 30 amps on mine, I think, so the swing is potentially greater.
The amp meter simply indicates if you are producing excess amps from the alternator, or if you are using amps as fast as they are produced. The majority of the time you drive, you should have the RPM's up, so the alternator is more effcient, and hope you are producing excess amps and charging the battery. Lots of idling with lots on, will draw the battery down.
Another indicator of good operation, and perhaps marginal grounds, is if you turn on the heater blower, or lights, and you get a big spike to the negative and then it recovers, you just pulled several amps to start the heater blower, and then it trimmed out.
Beautiful restoration Shane, mine was not that good, I did it in Highschool with my dad, but I remember well all the small things that were just too worn to save, or were not available or we found an alternative for the part. It all boils down to cost and time, we had well over 8000 in my 73 in 1997, and could have put several thousand more into it. I wish we had used Japan spec bolts, I ended up with a mixed bag of metric head sizes because you can't easily source the right ones. That makes a big visual difference right there. Of course MUD was not around then either, all mail order from MAF and SOR and such back then. Alot of great resources available now. Sadly I drove mine, the cancer came back, I have banged it up a few times, rolled on the side twice, and old dirvetrains just leak after awhile, but they are great rigs. I know I can appreciate a good restoration.