diff --git a/Aircraft/Instruments/egt-ff-c172s.xml b/Aircraft/Instruments/egt-ff-c172s.xml
index 03d43a866..ad362d2c6 100644
--- a/Aircraft/Instruments/egt-ff-c172s.xml
+++ b/Aircraft/Instruments/egt-ff-c172s.xml
@@ -55,8 +55,8 @@ Jan 26 2003
     <transformation>
      <condition>
       <greater-than-equals>
-       <property>/systems/electrical/outputs/bus</property>
-       <value>30</value>
+       <property>/systems/electrical/volts</property>
+       <value>12</value>
       </greater-than-equals>
      </condition>
      <type>rotation</type>
@@ -69,8 +69,8 @@ Jan 26 2003
     <transformation>
      <condition>
       <less-than>
-       <property>/systems/electrical/outputs/bus</property>
-       <value>30</value>
+       <property>/systems/electrical/volts</property>
+       <value>12</value>
       </less-than>
      </condition>
      <type>rotation</type>
@@ -102,8 +102,8 @@ Jan 26 2003
     <transformation>
      <condition>
       <greater-than-equals>
-       <property>/systems/electrical/outputs/bus</property>
-       <value>30</value>
+       <property>/systems/electrical/volts</property>
+       <value>12</value>
       </greater-than-equals>
      </condition>
      <type>rotation</type>
@@ -125,8 +125,8 @@ Jan 26 2003
     <transformation>
      <condition>
       <less-than>
-       <property>/systems/electrical/outputs/bus</property>
-       <value>30</value>
+       <property>/systems/electrical/volts</property>
+       <value>12</value>
       </less-than>
      </condition>
      <type>rotation</type>
@@ -306,4 +306,4 @@ Jan 26 2003
 
  </actions>
 
-</PropertyList>
\ No newline at end of file
+</PropertyList>
diff --git a/Aircraft/Instruments/fuel-c172s.xml b/Aircraft/Instruments/fuel-c172s.xml
index 5d22790b5..e54a77a76 100644
--- a/Aircraft/Instruments/fuel-c172s.xml
+++ b/Aircraft/Instruments/fuel-c172s.xml
@@ -55,8 +55,8 @@ Feb 7 2003
     <transformation>
      <condition>
       <greater-than-equals>
-       <property>/systems/electrical/outputs/bus</property>
-       <value>30</value>
+       <property>/systems/electrical/volts</property>
+       <value>12</value>
       </greater-than-equals>
      </condition>
      <type>rotation</type>
@@ -77,8 +77,8 @@ Feb 7 2003
     <transformation>
      <condition>
       <less-than>
-       <property>/systems/electrical/outputs/bus</property>
-       <value>30</value>
+       <property>/systems/electrical/volts</property>
+       <value>12</value>
       </less-than>
      </condition>
      <type>rotation</type>
@@ -110,8 +110,8 @@ Feb 7 2003
     <transformation>
      <condition>
       <greater-than-equals>
-       <property>/systems/electrical/outputs/bus</property>
-       <value>30</value>
+       <property>/systems/electrical/volts</property>
+       <value>12</value>
       </greater-than-equals>
      </condition>
      <type>rotation</type>
@@ -132,8 +132,8 @@ Feb 7 2003
     <transformation>
      <condition>
       <less-than>
-       <property>/systems/electrical/outputs/bus</property>
-       <value>30</value>
+       <property>/systems/electrical/volts</property>
+       <value>12</value>
       </less-than>
      </condition>
      <type>rotation</type>
diff --git a/Aircraft/Instruments/oil-c172s.xml b/Aircraft/Instruments/oil-c172s.xml
index 9c6ea8557..b5cbed4dd 100644
--- a/Aircraft/Instruments/oil-c172s.xml
+++ b/Aircraft/Instruments/oil-c172s.xml
@@ -55,8 +55,8 @@ Feb 9 2003
     <transformation>
      <condition>
       <greater-than-equals>
-       <property>/systems/electrical/outputs/bus</property>
-       <value>30</value>
+       <property>/systems/electrical/volts</property>
+       <value>12</value>
       </greater-than-equals>
      </condition>
      <type>rotation</type>
@@ -78,8 +78,8 @@ Feb 9 2003
     <transformation>
      <condition>
       <less-than>
-       <property>/systems/electrical/outputs/bus</property>
-       <value>30</value>
+       <property>/systems/electrical/volts</property>
+       <value>12</value>
       </less-than>
      </condition>
      <type>rotation</type>
@@ -111,8 +111,8 @@ Feb 9 2003
     <transformation>
      <condition>
       <greater-than-equals>
-       <property>/systems/electrical/outputs/bus</property>
-       <value>30</value>
+       <property>/systems/electrical/volts</property>
+       <value>12</value>
       </greater-than-equals>
      </condition>
      <type>rotation</type>
@@ -135,8 +135,8 @@ Feb 9 2003
     <transformation>
      <condition>
       <less-than>
-       <property>/systems/electrical/outputs/bus</property>
-       <value>30</value>
+       <property>/systems/electrical/volts</property>
+       <value>12</value>
       </less-than>
      </condition>
      <type>rotation</type>
@@ -210,4 +210,4 @@ Feb 9 2003
 				  
  </layers>
 
-</PropertyList>
\ No newline at end of file
+</PropertyList>
diff --git a/Aircraft/Instruments/vor1-c172s.xml b/Aircraft/Instruments/vor1-c172s.xml
index 6799dd00b..d85e177f3 100644
--- a/Aircraft/Instruments/vor1-c172s.xml
+++ b/Aircraft/Instruments/vor1-c172s.xml
@@ -213,9 +213,9 @@ Jan 26 2003
      <type>rotation</type>
      <offset>0</offset>
      <property alias="../../../../../params/nav-gs-needle-deflection"/>
-     <min>-10.0</min>
-     <max>10.0</max>
-     <scale>-3.2</scale>
+     <min>-3.5</min>
+     <max>3.5</max>
+     <scale>-10.0</scale>
     </transformation>
    </transformations>
   </layer>
@@ -240,9 +240,9 @@ Jan 26 2003
      <type>rotation</type>
      <offset>0</offset>
      <property alias="../../../../../params/nav-gs-needle-deflection"/>
-     <min>-10.0</min>
-     <max>10.0</max>
-     <scale>-3.2</scale>
+     <min>-3.5</min>
+     <max>3.5</max>
+     <scale>-10.0</scale>
     </transformation>
     <transformation>
      <type>x-shift</type>