Only on 2009 and newer MF Axial combines will the pressures show up on the C2100 monitor. they have a sensor built into their hydraulic valve on the combine that shows the pressure for the header.
all Transverse Gleaner combines must have a 100 dollar pressure gauge added to the right side of the feeder house to show pressure. I agree it is hard to read from cab and I have really good eye sight.
The blue readings you see in the cab are the height sensors voltages left and right hand side. The Dyna flex has three sensors left and three right for the cutter bar but the combine can only see two voltage readings, one on the left and one on the right. the little black box on the left hand side of header near single point hydraulic/electrical connector takes the three readings from the left and averages them into one signal back to combine and same thing for the right. For correct operation and best, all three on the left need to start out reading same and same for right. that is what the dealer should do for a calibration plus go though the procedure in the combine for it to learn what the voltage readings are. Starting out with the same voltage on level ground means when the little black box averages the three into one the reading sent back to the combine is more accurate. Make sure when header is down that the voltage is above 1 volt to pass calibration. Same goes for feeder sensor when header down must be above 1 volt to pass, if not you will get a header ERR on the EIP display.
Hopefully this clears things up a little.
Jeff