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You have the old 1960's style of Delcotron. The side terminals will sort of form a cross, or are parallel out the back. If you have a Delcotron where those terminals are in line with each other, there is a regulator inside already. (the one wire unit mentioned by others was originally a marine application, and usually easier to find that way). I am assuming that you have an oil pressure switch with two terminals so that in the event oil pressure goes to zero, that there will be no power to the coil, etc. In normal operation, a single terminal oil pressure switch provides the ground path for the guage, which will read 12 volts on the terminal with engine off, key switch in run position. If this is the case, run another wire from the ignition switch that goes "hot" in the run position, there are usually 2 or three available terminals that switch hot in the run position. You will need to make a connection for the number 2 terminal on the regulator through a 10 ohm resistance wire with a power rating of at least 6.25 watts which goes to the "R" terminal on the alternator. This controls the output voltage of the alternator, and if not connected, will not charge. You would need to get a harness section that includes that section of wire, or you need to find a suitable substitute. The newer Delcotron could be used, but you need to make sure that when the tractor is shut down, that the two leads to the side of the alternor are open circuited from everything.
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