Is the transistor thing for orbitrol pressure sensor? If I understood correctly, the potentiometer is used to select a triggering voltage from the pressure sensors 0-5V scale?
Glad to hear that the steering sensor worked with the Y-cable, as that’s exactly what I planned to do.
I’m trying to do the same thing with my case ih puma 230, its basically the same tractor with exactly the same wiring. I hope to get my project done in a few weeks.