Index: firmware/App/Drivers/PressureSensor.c
===================================================================
diff -u -r311c75cc5ac41b4b9ca4983df84e43af910f9be4 -r94d93795b2a516b3bdd7fc7030eb5eac933bfcd0
--- firmware/App/Drivers/PressureSensor.c	(.../PressureSensor.c)	(revision 311c75cc5ac41b4b9ca4983df84e43af910f9be4)
+++ firmware/App/Drivers/PressureSensor.c	(.../PressureSensor.c)	(revision 94d93795b2a516b3bdd7fc7030eb5eac933bfcd0)
@@ -33,10 +33,9 @@
 #define COUNTS_TO_MILLI_BAR                         100                                                 ///< Counts to milli-bar conversion.
 #define BAR_TO_MMHG                                 ( 750.062F )                                        ///< Conversion factor for converting bar to mmHg.
 #define PRES_SENSORS_READ_ERR_MAX_CNT               0xFF                                                ///< Pressure sensor read and error max count value
+#define PRES_MIN_PSI                                -14.5038F                                           ///< Minimum value for PSI conversion
+#define HIGH_PRES_MAX_PSI                           145.038F                                            ///< Maximum range of pressure sensors (in PSI)
 
-#define PRES_MIN_PSI                                0.0F                                                ///< Minimum range of pressure sensors (in PSI)
-#define PRES_MAX_PSI                                145.038F                                            ///< Maximum range of pressure sensors (in PSI)
-
 // ********** private data **********
 
 static OVERRIDE_F32_T currentPressureReadings[ NUM_OF_PRESSURE_SENSORS ];                               ///< Current pressure sensor pressure readings (overrideable).
@@ -98,15 +97,15 @@
 void readPressureSensors( void )
 {
     // Update and convert raw pressures to mmHg
-    currentPressureReadings[ M1_PRES ].data = convertPressureReading( getFPGAM1RawPressure(), PRES_MIN_PSI, PRES_MAX_PSI );
-    currentPressureReadings[ M3_PRES ].data   = convertPressureReading( getFPGAM3RawPressure(), PRES_MIN_PSI, PRES_MAX_PSI );
-    currentPressureReadings[ P8_PRES ].data = convertPressureReading( getFPGAP8RawPressure(), PRES_MIN_PSI, PRES_MAX_PSI );
-    currentPressureReadings[ P13_PRES ].data   = convertPressureReading( getFPGAP13RawPressure(), PRES_MIN_PSI, PRES_MAX_PSI );
-    currentPressureReadings[ P17_PRES ].data = convertPressureReading( getFPGAP17RawPressure(), PRES_MIN_PSI, PRES_MAX_PSI );
-    currentPressureReadings[ X1_PRES ].data = convertPressureReading( getFPGAX1RawPressure(), PRES_MIN_PSI, PRES_MAX_PSI );
-    currentPressureReadings[ X2_PRES ].data = convertPressureReading( getFPGAX2RawPressure(), PRES_MIN_PSI, PRES_MAX_PSI );
-    currentPressureReadings[ X3_PRES ].data = convertPressureReading( getFPGAX3RawPressure(), PRES_MIN_PSI, PRES_MAX_PSI );
-    currentPressureReadings[ X4_PRES ].data = convertPressureReading( getFPGAX4RawPressure(), PRES_MIN_PSI, PRES_MAX_PSI );
+    currentPressureReadings[ M1_PRES ].data = convertPressureReading( getFPGAM1RawPressure(), PRES_MIN_PSI, HIGH_PRES_MAX_PSI );
+    currentPressureReadings[ M3_PRES ].data   = convertPressureReading( getFPGAM3RawPressure(), PRES_MIN_PSI, HIGH_PRES_MAX_PSI );
+    currentPressureReadings[ P8_PRES ].data = convertPressureReading( getFPGAP8RawPressure(), PRES_MIN_PSI, HIGH_PRES_MAX_PSI );
+    currentPressureReadings[ P13_PRES ].data   = convertPressureReading( getFPGAP13RawPressure(), PRES_MIN_PSI, HIGH_PRES_MAX_PSI );
+    currentPressureReadings[ P17_PRES ].data = convertPressureReading( getFPGAP17RawPressure(), PRES_MIN_PSI, HIGH_PRES_MAX_PSI );
+    currentPressureReadings[ X1_PRES ].data = convertPressureReading( getFPGAX1RawPressure(), PRES_MIN_PSI, HIGH_PRES_MAX_PSI );
+    currentPressureReadings[ X2_PRES ].data = convertPressureReading( getFPGAX2RawPressure(), PRES_MIN_PSI, HIGH_PRES_MAX_PSI );
+    currentPressureReadings[ X3_PRES ].data = convertPressureReading( getFPGAX3RawPressure(), PRES_MIN_PSI, HIGH_PRES_MAX_PSI );
+    currentPressureReadings[ X4_PRES ].data = convertPressureReading( getFPGAX4RawPressure(), PRES_MIN_PSI, HIGH_PRES_MAX_PSI );
 
     // Update and convert raw pressure sensor temperatures to deg C
     currentPresTempReadings[ M1_PRES ].data = convertPressureTempReading2DegC( getFPGAM1RawTemperature() );