Ports......you had me for a minute on that. Then, I figured out that you are of the PC generation & I'm not! :) To me, they are terminals.
Looking at it from the front, you have left, middle & right. W/ 2 exceptions, all wires go to the center terminal; it's always hot because the wire from the battery connects to it. The wire on the left terminal goes to the coil. The wire on the right is FROM the ignition switch. One side of the ignition switch is hot, the other isn't. When you turn the key on, the current flowing from the center terminal to the switch now flows to the right terminal and through the resistor to the coil.
The ammeter has a loop or terminals. It all works the same; the current comes from the battery to the solenoid then to the ammeter then to the middle terminal.
As far as wiring diagrams go, it doesn't get much simpler than that.
Sorry, I don't own a 2N & the wiring is slightly different, so I can't send you a diagram. But, do an archives search on "wiring diagram JMOR". Jesse, aka JMOR, has previously posted his; I like them because they have actual pictures of each part.
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