🐛 Redundant Temp Sensor followup (#22173)

Marlin/src/inc/Conditionals_post.h

@@ -526,7 +526,17 @@
 #undef ANY_TEMP_SENSOR_IS
 
 // Usurp a sensor to do redundant readings
-#if TEMP_SENSOR_REDUNDANT && !PIN_EXISTS(TEMP_REDUNDANT)
+#if TEMP_SENSOR_REDUNDANT
+  #ifndef TEMP_SENSOR_REDUNDANT_SOURCE
+    #define TEMP_SENSOR_REDUNDANT_SOURCE 1
+  #endif
+  #ifndef TEMP_SENSOR_REDUNDANT_TARGET
+    #define TEMP_SENSOR_REDUNDANT_TARGET 0
+  #endif
+  #if !PIN_EXISTS(TEMP_REDUNDANT)
+    #ifndef TEMP_SENSOR_REDUNDANT_MAX_DIFF
+      #define TEMP_SENSOR_REDUNDANT_MAX_DIFF 10
+    #endif
     #if TEMP_SENSOR_REDUNDANT_SOURCE == -5
       #if !PIN_EXISTS(TEMP_COOLER)
         #error "TEMP_SENSOR_REDUNDANT_SOURCE set to COOLER requires TEMP_COOLER_PIN."
@@ -600,9 +610,6 @@
         #define TEMP_REDUNDANT_PIN TEMP_7_PIN
       #endif
     #endif
-
-  #ifndef TEMP_SENSOR_REDUNDANT_MAX_DIFF
-    #define TEMP_SENSOR_REDUNDANT_MAX_DIFF 10
   #endif
 #endif
 

Marlin/src/module/temperature.cpp

@@ -2090,16 +2090,30 @@ void Temperature::init() {
   #endif
 
   #if HAS_MAX31865_TEMP
-    TERN_(TEMP_SENSOR_IS_MAX(0, MAX31865), max31865_0.begin(MAX31865_2WIRE)); // MAX31865_2WIRE, MAX31865_3WIRE, MAX31865_4WIRE
+    #if TEMP_SENSOR_IS_MAX(0, MAX31865)
-    TERN_(TEMP_SENSOR_IS_MAX(1, MAX31865), max31865_1.begin(MAX31865_2WIRE));
+      max31865_0.begin(MAX31865_2WIRE); // MAX31865_2WIRE, MAX31865_3WIRE, MAX31865_4WIRE
     #endif
+    #if TEMP_SENSOR_IS_MAX(1, MAX31865)
+      max31865_1.begin(MAX31865_2WIRE);
+    #endif
+  #endif
+
   #if HAS_MAX31855_TEMP
-    TERN_(TEMP_SENSOR_IS_MAX(0, MAX31855), max31855_0.begin());
+    #if TEMP_SENSOR_IS_MAX(0, MAX31855)
-    TERN_(TEMP_SENSOR_IS_MAX(1, MAX31855), max31855_1.begin());
+      max31855_0.begin(MAX31855);
+    #endif
+    #if TEMP_SENSOR_IS_MAX(1, MAX31855)
+      max31855_1.begin(MAX31855);
+    #endif
   #endif
+
   #if HAS_MAX6675_TEMP
-    TERN_(TEMP_SENSOR_IS_MAX(0, MAX6675), max6675_0.begin());
+    #if TEMP_SENSOR_IS_MAX(0, MAX6675)
-    TERN_(TEMP_SENSOR_IS_MAX(1, MAX6675), max6675_1.begin());
+      max6675_0.begin(MAX6675);
+    #endif
+    #if TEMP_SENSOR_IS_MAX(1, MAX6675)
+      max6675_1.begin(MAX6675);
+    #endif
   #endif
 
   #if MB(RUMBA)