That alternator will fry an original IH amp meter. The use of a volt meter is OK, and between the alternator, and the volt meter, originality is not happening. A volt meter can be found that has the same face character and size, but the needle and markings will be different. There should be a fusable link in the main heavy wire from the alternator to the starter switch "battery terminal". The fuse link should be 85 amps or so to protect the alternator while allowing it to operate fully without blowing the fuse. Operating the volt meter can be as simple as just hooking it to the big alt wire on its + side, and grounding the other side. It will be on all the time, but they draw very little current, and are commonly left on. The other way is to switch it on with the ignition, (either way works) If an amp meter is used, it should be + or - 100 amps to allow full scale readings. Charge voltage should be 14.2 to 14.7 volts at mid RPM. Jim
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