fgdata/Aircraft/Instruments-3d/alt/alt.xml

<?xml version="1.0"?>

<PropertyList>

 <path>alt.ac</path>

 <animation>
  <type>rotate</type>
  <object-name>Needle100</object-name>
  <property>/instrumentation/altimeter/indicated-altitude-ft</property>
  <factor>0.36</factor>
  <axis>
   <x>-1</x>
   <y>0</y>
   <z>0</z>
  </axis>
 </animation>

 <animation>
  <type>rotate</type>
  <object-name>Needle1000</object-name>
  <property>/instrumentation/altimeter/indicated-altitude-ft</property>
  <factor>0.036</factor>
  <axis>
   <x>-1</x>
   <y>0</y>
   <z>0</z>
  </axis>
 </animation>

 <animation>
  <type>rotate</type>
  <object-name>Needle10000</object-name>
  <property>/instrumentation/altimeter/indicated-altitude-ft</property>
  <factor>0.0036</factor>
  <axis>
   <x>-1</x>
   <y>0</y>
   <z>0</z>
  </axis>
 </animation>

</PropertyList>