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If the ignition switch (key or lever type) has only two terminals then it is a simple on-off type so that's pretty straighforward. I'm sure you are dealing with a 6 volt positive ground system here so make sure you have a good ground strap from the + battery terminal to the tractor engine or frame. Anyways, the solonoid should probably have two big terminals on it and one small one is that right? Mounting the solonoid on the tractor provides it's ground. There should be a big heavy cable from the negative terminal of the battery to one big terminal (either one) on the solonoid switch. There should be another big heavy cable (same type) from the other heavy lug on the solonoid to the starter terminal. Now somewhere (either directly from the negative side of the battery or maybe from the battery side of the solonoid switch) you should have a smaller wire that goes to the + terminal of the ammeter. This wire should be a bit heavier than the other regular wire on the tractor, maybe #12 wire. Coming out of the - terminal of the ammeter should be at least one wire (there could be others going to the lights, maybe to the generator depending on what type of generator you have, etc.). This wire from the - ammeter terminal should head to one side of your ignition switch, then another wire from the other terminal of your ignition switch to the negative side of the coil. Then a wire from the + side of the coil to the terminal on the side of the distributor. Now, for the starting button. You need to get power (via a wire) from either the battery - terminal (or from the battery side of the solonoid) to one of the terminals on the start button. Then another wire from the other terminal on the start button to the small terminal on the solonoid. When you push the start button, the solonoid connects power through the two heavy cables at the solonoid and the starter spins. Hope this makes sense. Draw out all the electrical components on a piece of paper (switches, etc. with terminals) and walk through what I did here and it will make sense to you. Email me on the blue name link above if you've got another question. Keep in mind that this is just one way of doing it, probably similar to the original Massey wiring. There would be other ways of tying both those switches into the electrical circuit that would work equally well.
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