Welcome to the SeeMeCNC Community

I'm trying my first print, the EZFan Shroud. But the program never runs due to what I think is an issue with the Bed Heat value. The program status says: 88.93/92. But the LCD display shows the bed hitting the mark: 91.9/92 (Fluctuates around 92 though).

Why does the software not see the proper heat value?

They bet the values from slightly different places, the LCD gets it directly from a variable in the firmware.
The host gets it via a regular transmission of the value over the USB connection.

What temperature are you waiting for it to reach?
If it's much higher than 90 C it might never get there, the size of the Onyx works against it in this regard.

Thanks for the clarity. After much rewiring and adding in another power supply just for the Onyx Bed, everything is working as it should. The software is tracking the same voltage as the LCD screen and the bed is running at 90c (as per the Fan Shroud program)

Good job in getting it working. Adding a few wires in the right places can make a difference.
Happy Printing!