Massey ferguson 165 alternator and wiring issue

[rickmasseyferguson]

Hi I have a massey ferguson 165 deisel tractor. I think it's a 1972 (9A 139627). It had a generator I think and an external regulator. Also has switch underneath oil pressure gauge. The wiring has been worked on by the previous owners. It is in complete shambles. The previous owner said just to put the battery in and disconnect the wiring after starting. I need to get the wiring sorted out.

I have a 3 wire alternator and a 4 post ignition switch that I will be using. See attached wiring diagram that I came up with. Will that work? And if it would, what wire should goto the starter solenoid bolt labeled "R"??