diff --git a/radio/src/gui/128x64/model_setup.cpp b/radio/src/gui/128x64/model_setup.cpp
index 9a5f4bd69..8ac5fc51f 100644
--- a/radio/src/gui/128x64/model_setup.cpp
+++ b/radio/src/gui/128x64/model_setup.cpp
@@ -631,12 +631,13 @@ void menuModelSetup(event_t event)
       case ITEM_MODEL_SETUP_THROTTLE_TRACE:
       {
         lcdDrawTextAlignedLeft(y, STR_TTRACE);
-        if (attr) CHECK_INCDEC_MODELVAR_ZERO(event, g_model.thrTraceSrc, NUM_POTS+NUM_SLIDERS+MAX_OUTPUT_CHANNELS);
-        uint8_t idx = g_model.thrTraceSrc + MIXSRC_Thr;
-        if (idx > MIXSRC_Thr)
-          idx += 1;
-        if (idx >= MIXSRC_FIRST_POT+NUM_POTS+NUM_SLIDERS)
-          idx += MIXSRC_CH1 - MIXSRC_FIRST_POT - NUM_POTS - NUM_SLIDERS;
+        if (attr)
+          CHECK_INCDEC_MODELVAR_ZERO_CHECK(
+              event, g_model.thrTraceSrc,
+              NUM_POTS + NUM_SLIDERS + MAX_OUTPUT_CHANNELS,
+              isThrottleSourceAvailable);
+
+        uint8_t idx = throttleSource2Source(g_model.thrTraceSrc);
         drawSource(MODEL_SETUP_2ND_COLUMN, y, idx, attr);
         break;
       }
diff --git a/radio/src/gui/212x64/model_setup.cpp b/radio/src/gui/212x64/model_setup.cpp
index 5b187a545..2bc541987 100644
--- a/radio/src/gui/212x64/model_setup.cpp
+++ b/radio/src/gui/212x64/model_setup.cpp
@@ -606,12 +606,13 @@ void menuModelSetup(event_t event)
       case ITEM_MODEL_SETUP_THROTTLE_TRACE:
       {
         lcdDrawTextAlignedLeft(y, STR_TTRACE);
-        if (attr) CHECK_INCDEC_MODELVAR_ZERO_CHECK(event, g_model.thrTraceSrc, NUM_POTS+NUM_SLIDERS+MAX_OUTPUT_CHANNELS, isThrottleSourceAvailable);
-        uint8_t idx = g_model.thrTraceSrc + MIXSRC_Thr;
-        if (idx > MIXSRC_Thr)
-          idx += 1;
-        if (idx >= MIXSRC_FIRST_POT+NUM_POTS+NUM_SLIDERS)
-          idx += MIXSRC_CH1 - MIXSRC_FIRST_POT - NUM_POTS - NUM_SLIDERS;
+        if (attr)
+          CHECK_INCDEC_MODELVAR_ZERO_CHECK(
+              event, g_model.thrTraceSrc,
+              NUM_POTS + NUM_SLIDERS + MAX_OUTPUT_CHANNELS,
+              isThrottleSourceAvailable);
+
+        uint8_t idx = throttleSource2Source(g_model.thrTraceSrc);
         drawSource(MODEL_SETUP_2ND_COLUMN, y, idx, attr);
         break;
       }
diff --git a/radio/src/gui/colorlcd/model_setup.cpp b/radio/src/gui/colorlcd/model_setup.cpp
index 6e6f97265..85e8a8e20 100644
--- a/radio/src/gui/colorlcd/model_setup.cpp
+++ b/radio/src/gui/colorlcd/model_setup.cpp
@@ -1141,27 +1141,15 @@ void ModelSetupPage::build(FormWindow * window)
     new StaticText(window, grid.getLabelSlot(true), STR_TTRACE);
     auto sc = new SourceChoice(
         window, grid.getFieldSlot(), 0, MIXSRC_LAST_CH,
-        [=]() {
-          int16_t src = g_model.thrTraceSrc;
-          if (src == 0) return (int16_t)MIXSRC_Thr;
-          if (--src < NUM_POTS + NUM_SLIDERS) return (int16_t)(src + MIXSRC_FIRST_POT);
-          return (int16_t)(src - (NUM_POTS + NUM_SLIDERS) + MIXSRC_FIRST_CH);
-        },
+        [=]() { return throttleSource2Source(g_model.thrTraceSrc); },
         [=](int16_t src) {
-          if (src == MIXSRC_Thr)
-            g_model.thrTraceSrc = 0;
-          else if (src <= MIXSRC_LAST_POT)
-            g_model.thrTraceSrc = src - MIXSRC_FIRST_POT + 1;
-          else if (src <= MIXSRC_LAST_CH)
-            g_model.thrTraceSrc = src - MIXSRC_FIRST_CH + NUM_POTS + NUM_SLIDERS + 1;
-          SET_DIRTY();
+          int16_t val = source2ThrottleSource(src);
+          if (val >= 0) {
+            g_model.thrTraceSrc = val;
+            SET_DIRTY();
+          }
         });
-    sc->setAvailableHandler([=](int16_t src) {
-      return isSourceAvailable(src) &&
-             ((src == MIXSRC_Thr) ||
-              ((src >= MIXSRC_FIRST_POT) && (src <= MIXSRC_LAST_POT)) ||
-              ((src >= MIXSRC_FIRST_CH) && (src <= MIXSRC_LAST_CH)));
-    });
+    sc->setAvailableHandler(isThrottleSourceAvailable);
     grid.nextLine();
 
     // Throttle trim
diff --git a/radio/src/gui/gui_common.cpp b/radio/src/gui/gui_common.cpp
index d243d154f..f703aa5e3 100644
--- a/radio/src/gui/gui_common.cpp
+++ b/radio/src/gui/gui_common.cpp
@@ -442,12 +442,15 @@ bool isSwitch2POSWarningStateAvailable(int state)
 //  return isSwitchAvailable(swtch, TimersContext);
 //}
 
-bool isThrottleSourceAvailable(int source)
+bool isThrottleSourceAvailable(int src)
 {
-  if (source >= THROTTLE_SOURCE_FIRST_POT && source < THROTTLE_SOURCE_FIRST_POT+NUM_POTS+NUM_SLIDERS && !IS_POT_SLIDER_AVAILABLE(POT1+source-THROTTLE_SOURCE_FIRST_POT))
-    return false;
-  else
-    return true;
+#if !defined(LIBOPENUI)
+  src = throttleSource2Source(src);
+#endif
+  return isSourceAvailable(src) &&
+    ((src == MIXSRC_Thr) ||
+     ((src >= MIXSRC_FIRST_POT) && (src <= MIXSRC_LAST_POT)) ||
+     ((src >= MIXSRC_FIRST_CH) && (src <= MIXSRC_LAST_CH)));
 }
 
 bool isLogicalSwitchFunctionAvailable(int function)
diff --git a/radio/src/myeeprom.h b/radio/src/myeeprom.h
index 438989eb0..ac9f9d460 100644
--- a/radio/src/myeeprom.h
+++ b/radio/src/myeeprom.h
@@ -229,32 +229,6 @@ enum SwashType {
 
 #include "pulses/modules_constants.h"
 
-enum ThrottleSources {
-  THROTTLE_SOURCE_THR,
-  THROTTLE_SOURCE_FIRST_POT,
-#if defined(PCBX9E)
-  THROTTLE_SOURCE_F1 = THROTTLE_SOURCE_FIRST_POT,
-  THROTTLE_SOURCE_F2,
-  THROTTLE_SOURCE_F3,
-  THROTTLE_SOURCE_F4,
-  THROTTLE_SOURCE_S1,
-  THROTTLE_SOURCE_S2,
-  THROTTLE_SOURCE_LS,
-  THROTTLE_SOURCE_RS,
-#elif defined(PCBTARANIS)
-  THROTTLE_SOURCE_S1 = THROTTLE_SOURCE_FIRST_POT,
-  THROTTLE_SOURCE_S2,
-  THROTTLE_SOURCE_S3,
-  THROTTLE_SOURCE_LS,
-  THROTTLE_SOURCE_RS,
-#else
-  THROTTLE_SOURCE_P1 = THROTTLE_SOURCE_FIRST_POT,
-  THROTTLE_SOURCE_P2,
-  THROTTLE_SOURCE_P3,
-#endif
-  THROTTLE_SOURCE_CH1,
-};
-
 enum DisplayTrims
 {
   DISPLAY_TRIMS_NEVER,
diff --git a/radio/src/timers.cpp b/radio/src/timers.cpp
index 0ee289e78..c3d336b1f 100644
--- a/radio/src/timers.cpp
+++ b/radio/src/timers.cpp
@@ -174,3 +174,22 @@ void evalTimers(int16_t throttle, uint8_t tick10ms)
     }
   }
 }
+
+int16_t throttleSource2Source(int16_t thrSrc)
+{
+  if (thrSrc == 0) return (int16_t)MIXSRC_Thr;
+  if (--thrSrc < NUM_POTS + NUM_SLIDERS)
+    return (int16_t)(thrSrc + MIXSRC_FIRST_POT);
+  return (int16_t)(thrSrc - (NUM_POTS + NUM_SLIDERS) + MIXSRC_FIRST_CH);
+}
+
+int16_t source2ThrottleSource(int16_t src)
+{
+  if (src == MIXSRC_Thr)
+    return 0;
+  else if (src <= MIXSRC_LAST_POT)
+    return src - MIXSRC_FIRST_POT + 1;
+  else if (src <= MIXSRC_LAST_CH)
+    return src - MIXSRC_FIRST_CH + NUM_POTS + NUM_SLIDERS + 1;
+  return -1;
+}
diff --git a/radio/src/timers.h b/radio/src/timers.h
index fb5f7a4be..5226414a0 100644
--- a/radio/src/timers.h
+++ b/radio/src/timers.h
@@ -62,4 +62,7 @@ static inline tmr10ms_t get_tmr10ms()
   return g_tmr10ms;
 }
 
+int16_t throttleSource2Source(int16_t thrSrc);
+int16_t source2ThrottleSource(int16_t src);
+
 #endif // _TIMERS_H_