Index: firmware/App/Monitors/Conductivity.c
===================================================================
diff -u -rbd896114f304304a7096b30b2a85067a64645e82 -r019e570cacd748a39dfbd500fe5bd65f596f488c
--- firmware/App/Monitors/Conductivity.c	(.../Conductivity.c)	(revision bd896114f304304a7096b30b2a85067a64645e82)
+++ firmware/App/Monitors/Conductivity.c	(.../Conductivity.c)	(revision 019e570cacd748a39dfbd500fe5bd65f596f488c)
@@ -8,7 +8,7 @@
 * @file    Conductivity.c
 *
 * @author  (last)      Michael Garthwaite
-* @date    (last)      27-Jan-2026
+* @date    (last)      06-Mar-2026
 *
 * @author  (original)  Vinayakam Mani
 * @date    (original)  13-Sep-2024
@@ -253,13 +253,21 @@
 static void filterConductivitySensorReadings( void )
 {
     CONDUCTIVITY_SENSORS_T sensor;
+    F32 rawCond = 0.0F;
 
     for ( sensor = FIRST_DD_COND_SENSOR; sensor < NUM_OF_CONDUCTIVITY_SENSORS; sensor++ )
     {
 #ifdef __TEENSY_CONDUCTIVITY_DRIVER__
-        F32 rawCond = getTeensyConductivityValue( sensor );
+        if (sensor != D74_COND )
+        {
+            rawCond = getTeensyConductivityValue( sensor );
+        }
+        else
+        {
+            rawCond = getConductivityValue( sensor );
+        }
 #else
-        F32 rawCond = getConductivityValue( sensor );
+        rawCond = getConductivityValue( sensor );
 #endif
 
         // TODO - calibrate
@@ -317,13 +325,21 @@
 static void filterConductivitySensorTemperatureReadings( void )
 {
     CONDUCTIVITY_SENSORS_T sensor;
+    F32 rawTemp = 0.0F;
 
     for ( sensor = FIRST_DD_COND_SENSOR; sensor < NUM_OF_CONDUCTIVITY_SENSORS; sensor++ )
     {
 #ifdef __TEENSY_CONDUCTIVITY_DRIVER__
-        F32 rawTemp = getTeensyConductivityTemperatureValue( sensor );
+        if (sensor != D74_COND )
+        {
+            rawTemp = getTeensyConductivityTemperatureValue( sensor );
+        }
+        else
+        {
+            rawTemp = getConductivityTemperatureValue( sensor );
+        }
 #else
-        F32 rawTemp = getConductivityTemperatureValue( sensor );
+        rawTemp = getConductivityTemperatureValue( sensor );
 #endif
 
         // TODO - calibrate