diff --git a/core/src/abstractgaugeitem.cpp b/core/src/abstractgaugeitem.cpp
index 2458276..1c6d60b 100644
--- a/core/src/abstractgaugeitem.cpp
+++ b/core/src/abstractgaugeitem.cpp
@@ -35,6 +35,10 @@ AbstractGaugeItem::AbstractGaugeItem(QDeclarativeItem *parent) :
     m_low = 0;
     m_high = 0;
     m_decimal = 0;
+    m_lowDangerSet = false;
+    m_lowWarningSet = false;
+    m_highDangerSet = false;
+    m_highWarningSet = false;
 }
 
 double AbstractGaugeItem::getLow() {
@@ -59,6 +63,7 @@ double AbstractGaugeItem::getLowWarning() {
 
 void AbstractGaugeItem::setLowWarning(double lowWarning) {
     m_lowWarning = lowWarning;
+    m_lowWarningSet = true;
 }
 
 double AbstractGaugeItem::getLowDanger() {
@@ -67,6 +72,8 @@ double AbstractGaugeItem::getLowDanger() {
 
 void AbstractGaugeItem::setLowDanger(double lowDanger) {
     m_lowDanger = lowDanger;
+    m_lowDangerSet = true;
+
 }
 
 double AbstractGaugeItem::getHighWarning() {
@@ -75,6 +82,7 @@ double AbstractGaugeItem::getHighWarning() {
 
 void AbstractGaugeItem::setHighWarning(double highWarning) {
     m_highWarning = highWarning;
+    m_highWarningSet = true;
 }
 
 double AbstractGaugeItem::getHighDanger() {
@@ -83,6 +91,7 @@ double AbstractGaugeItem::getHighDanger() {
 
 void AbstractGaugeItem::setHighDanger(double highDanger) {
     m_highDanger = highDanger;
+    m_highDangerSet = true;
 }
 
 QString AbstractGaugeItem::getTitle() {
diff --git a/core/src/bargaugeitem.cpp b/core/src/bargaugeitem.cpp
index 238315e..149719b 100644
--- a/core/src/bargaugeitem.cpp
+++ b/core/src/bargaugeitem.cpp
@@ -71,13 +71,13 @@ void BarGaugeItem::drawBackground() {
     m_penBar.setColor(colorDanger);
     painter.setPen(m_penBar);
 
-    if (m_lowDanger) {
+    if (m_lowDangerSet) {
 	lengthLowDanger = ((m_lowDanger - m_low) / m_range) * m_barSize;
         painter.drawLine(m_padding, locationY, lengthLowDanger + m_padding - m_gap, locationY);
         barNormalStart += lengthLowDanger;
     }
 
-    if (m_highDanger) {
+    if (m_highDangerSet) {
 	lengthHighDanger = ((m_high - m_highDanger) / m_range) * m_barSize;
         painter.drawLine(m_padding + m_barSize - lengthHighDanger + m_gap, locationY, m_padding + m_barSize, locationY);
         barNormalEnd -= lengthHighDanger;
@@ -87,13 +87,13 @@ void BarGaugeItem::drawBackground() {
     m_penBar.setColor(colorWarning);
     painter.setPen(m_penBar);
 
-    if (m_lowWarning) {
+    if (m_lowWarningSet) {
 	int lengthLowWarning = ((m_lowWarning - m_low) / m_range) * m_barSize;
         painter.drawLine(m_padding + lengthLowDanger, locationY, lengthLowWarning + m_padding - m_gap, locationY);
         barNormalStart += (lengthLowWarning - lengthLowDanger);
     }
 
-    if (m_highWarning) {
+    if (m_highWarningSet) {
 	int lengthHighWarning = ((m_high - m_highWarning) / m_range) * m_barSize;
         painter.drawLine(m_padding + m_barSize - lengthHighWarning + m_gap, locationY, m_padding + m_barSize - lengthHighDanger, locationY);
         barNormalEnd -= (lengthHighWarning - lengthHighDanger);
diff --git a/core/src/roundgaugeitem.cpp b/core/src/roundgaugeitem.cpp
index f5e61ab..3d0d652 100644
--- a/core/src/roundgaugeitem.cpp
+++ b/core/src/roundgaugeitem.cpp
@@ -74,13 +74,13 @@ void RoundGaugeItem::drawBackground() {
     m_penArc.setColor(colorDanger);
     painter.setPen(m_penArc);
 
-    if (m_lowDanger) {
+    if (m_lowDangerSet) {
 	degreesLowDanger = (int ((m_lowDanger - m_low) * arcSize / m_range));
         painter.drawArc(m_locationXY, m_locationXY, m_sizeXY, m_sizeXY, (arcSize - degreesLowDanger + m_gap), (degreesLowDanger - m_gap));
         degreesNormalSize -= degreesLowDanger;
     }
 
-    if (m_highDanger) {
+    if (m_highDangerSet) {
 	degreesHighDanger = (int ((m_high - m_highDanger - m_low) * arcSize / m_range));
         painter.drawArc(m_locationXY, m_locationXY, m_sizeXY, m_sizeXY, 0, degreesHighDanger - m_gap);
         degreesNormalSize -= degreesHighDanger;
@@ -91,13 +91,13 @@ void RoundGaugeItem::drawBackground() {
     m_penArc.setColor(colorWarning);
     painter.setPen(m_penArc);
 
-    if (m_lowWarning) {
+    if (m_lowWarningSet) {
 	int degreesLowWarning = (int ((m_lowWarning - m_low) * arcSize / m_range));
         painter.drawArc(m_locationXY, m_locationXY, m_sizeXY, m_sizeXY, (arcSize - degreesLowWarning + m_gap), (degreesLowWarning - degreesLowDanger - m_gap));
         degreesNormalSize -= (degreesLowWarning - degreesLowDanger);
     }
 
-    if (m_highWarning) {
+    if (m_highWarningSet) {
 	int degreesHighWarning = (int ((m_high - m_highWarning - m_low) * arcSize / m_range));
         painter.drawArc(m_locationXY, m_locationXY, m_sizeXY, m_sizeXY, degreesHighDanger, (degreesHighWarning - degreesHighDanger - m_gap));
         degreesNormalSize -= (degreesHighWarning - degreesHighDanger);