You don’t mention the module part number you are using, so just go with the flow here and we can tweak it if needed…
The first step is to get your wiring right.
Either of these is what you are looking to do.
Since you are using an external power supply, you need to follow the top one most likely.
The ground of the power supply goes to the EPIC module, the positive of the power supply to the positive of the sensor and then from the sensor to the EPIC Module.
If your sensor is self powered, then just put the power onto the sensor and then the output of the sensor to the Module.
If you tell us the sensor part number, we can Google the manual for it and figure out the wiring for you.
Next is the EPIC input scaling.
Are you going to be using PAC Control to program it, or Codesys, or Python, or REST or any other method?
It matters as we need to show you how to configure the input for either of those.
For now, lets not worry about the programming and just set the scaling in groov Manage so we can see it working (But know that when you download your program, it will overwrite groov Manage and so you need to set the scaling correctly in your software).
In groov Manage call up the EPIC module and channel.
Hit the configure button and then set your range to 4 and 20 and then your units to be psi and your upper and lower scaled to be 0 and 15.
Hit save and go back one step and you should be reading the scaled units.
Let know how you get on and if you need any tweaks… we will get you up and running I’m sure.