I have a FB4 connected to an oil pressure sender.
The sender was three wires; 12V power, GRND and signal 0-5V
I have connected power and ground to a power and ground not on the board.
That leaves one wire only going to the brain's analog input signal.
I'm not reading any values on the input.
Do I need to connect the FB input ground to GRND?
Can I connect the sensor GRND to the FB input?