the green plug is a Engine Coolant Temp Switch (for rad fan)
the big black plug is a Engine Oil Temp Switch (also for rad fan, but not needed)
the small 1-wire plug is the Engine Oil Pressure Switch (for gauge oil light)
you've got it backwards. the 2 prong black plug is coolant temp for the radiator fan, it is needed. the green plug reads oil temp to activate the radiator fan, but is not needed.
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