The T3-OEM may be missing the 4-20ma option becuase its a cut down version of the T3 controllers. Hopefully when you are maneuvering in the T3 user interface it will not let you select that range setting.
The work around will be to use a 500 ohm resistor wired across the input terminal from plus to GND. Then wire in your signal to the plus, the 4-20ma current going through the resistor will be converted to a 2-10V signal. Once you have the signal working you can then head over to ‘custom analog inputs’ to configure the engieering units and scaling.
Here’s the math behind the current to voltage conversion thanks to GPT:
