Ah , that’s my mistake. I thought the 2 terminal unit was coolant temp - that’s the fan control sensor. I should have figured that out. Bad day.
The oil pressure sending unit is still on the bench.
Like I said, bad day , I was quite distracted. I guess that’s why I installed the nice new thermostat house while overlooking a certain detail. The thermostat is still on the bench too , right next to the oil pressure sending unit.
Side note : my truck is stored in the winter , no real cold weather starts. How badly do I need a thermostat?