Added hackish binding for booster to allow for two stages of pressure.

Added electrical system so that turn indicator works (real P-51D has
vacuum powered turn indicator).

Aircraft/p51d-set.xml

@@ -19,6 +19,12 @@ March 2003 Jim Wilson, jimw@kelcomaine.com
   <aero>p51d</aero>
   <fuel-fraction>0.75</fuel-fraction>
 
+  <systems>
+   <electrical>
+    <path>Aircraft/Generic/generic-electrical.xml</path>
+   </electrical>
+  </systems> 
+ 
   <virtual-cockpit archive="y">true</virtual-cockpit>
   <allow-toggle-cockpit archive="y">true</allow-toggle-cockpit>
 
@@ -117,8 +123,33 @@ March 2003 Jim Wilson, jimw@kelcomaine.com
         <name>Ctrl-B</name>
         <desc>Toggle engine boost.</desc>
         <binding>
-          <command>property-toggle</command>
+          <command>property-adjust</command>
           <property>/controls/engines/engine[0]/boost</property>
+          <step type="double">0.33</step>
+          <min type="double">0.0</min>
+          <max type="double">1.5</max>
+        </binding>
+        <binding>
+          <condition>
+          <greater-than>
+            <property>/controls/engines/engine[0]/boost</property>
+            <value type="double">1.0001</value>
+          </greater-than>
+          </condition>
+          <command>property-assign</command>
+          <property>/controls/engines/engine[0]/boost</property>
+          <value type="double">0.0</value>
+        </binding>
+        <binding>
+          <condition>
+          <greater-than>
+            <property>/controls/engines/engine[0]/boost</property>
+            <value type="double">0.55</value>
+          </greater-than>
+          </condition>
+          <command>property-assign</command>
+          <property>/controls/engines/engine[0]/boost</property>
+          <value type="double">1.0</value>
         </binding>
       </key>
      </keyboard>