diff --git a/companion/src/firmwares/opentx/opentxeeprom.cpp b/companion/src/firmwares/opentx/opentxeeprom.cpp
index fb6eca8ca..7e1f67224 100644
--- a/companion/src/firmwares/opentx/opentxeeprom.cpp
+++ b/companion/src/firmwares/opentx/opentxeeprom.cpp
@@ -2730,6 +2730,8 @@ class SensorField: public TransformedField {
       if (sensor.type == SensorData::TYPE_CUSTOM) {
         sensor.id = _id;
         sensor.instance = _instance;
+        sensor.ratio = _param & 0xFF;
+        sensor.offset = (_param >> 16) & 0xFF;
       }
       else {
         sensor.persistentValue = _id;
diff --git a/companion/src/modeledit/telemetry.cpp b/companion/src/modeledit/telemetry.cpp
index 5eb2fb33f..9e77effa4 100644
--- a/companion/src/modeledit/telemetry.cpp
+++ b/companion/src/modeledit/telemetry.cpp
@@ -643,7 +643,7 @@ void TelemetrySensorPanel::on_unit_currentIndexChanged(int index)
   }
 }
 
-void TelemetrySensorPanel::on_prec_editingFinished()
+void TelemetrySensorPanel::on_prec_valueChanged()
 {
   if (!lock) {
     sensor.prec = ui->prec->value();
diff --git a/companion/src/modeledit/telemetry.h b/companion/src/modeledit/telemetry.h
index 9be399456..c7f993e3f 100644
--- a/companion/src/modeledit/telemetry.h
+++ b/companion/src/modeledit/telemetry.h
@@ -95,7 +95,7 @@ class TelemetrySensorPanel: public ModelPanel
     void on_type_currentIndexChanged(int index);
     void on_formula_currentIndexChanged(int index);
     void on_unit_currentIndexChanged(int index);
-    void on_prec_editingFinished();
+    void on_prec_valueChanged();
 
   protected:
     void updateSourcesComboBox(AutoComboBox * cb, bool negative);