As miangus posted the diesel wiring is different. The alternator will be excited from the oil pressure switch. I do not have a 175 wiring diagram to rework for you, but from other MF diagrams I have, I believe there are connections for other things, made at the external regulator, which will need to be addressed as part of eliminating it properly. You will need a diode in the new excitation wire which will need to be run from the oil pressure switch (normally located behind the oil pressure gauge in the dash). You can purchase pigtails for the alternator with diodes already in them to save chasing for a diode to build your own (or adding a resistor or indicator lamp).
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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