The airspeed indicator can be initialized in an instrumentation.xml file. If not specified, the generic indicator will be loaded from the Aircraft/Generic/generic-instrumentation.xml. The normal setup is : <airspeed-indicator> <name>airspeed-indicator</name> <number>0</number> <total-pressure>/systems/pitot/total-pressure-inhg</total-pressure> <static-pressure>/systems/static/pressure-inhg</static-pressure> <has-overspeed-indicator>1</has-overspeed-indicator> </airspeed-indicator> Of course the total and static pressure may be sourced from any other pitot and static system when defined: <airspeed-indicator> <name>airspeed-indicator</name> <number>1</number> <total-pressure>/systems/pitot[1]/total-pressure-inhg</total-pressure> <static-pressure>/systems/static[1]/pressure-inhg</static-pressure> <has-overspeed-indicator>0</has-overspeed-indicator> </airspeed-indicator> Note that the Aircraft/Generic/generic-systems.xml only initiates one pitot and one static system, see also README.systems <total-pressure> is optional --- defaults to "/systems/pitot/total-pressure-inhg" For supersonic aircraft with an airspeed indicator NOT compensating for a shockwave in front of the pitot tube (most probably the case), use: <total-pressure>/systems/pitot/measured-total-pressure-inhg</total-pressure> <static-pressure> is optional --- defaults to "/systems/static/pressure-inhg" <has-overspeed-indicator> is optional --- defaults to 0 / off The <has-overspeed-indicator> provides a property for "barber-pole" animation, and is set to 0 / false by default , If enabled , these properties should be added in the aircraft -set file, with that aircraft's correct figures. <airspeed-indicator> <ias-limit>248.0</ias-limit> <mach-limit>0.48</mach-limit> <alt-threshold>13200.0</alt-threshold> </airspeed-indicator> The default values are for a Beechcraft B1900D . <ias-limit> is the aircraft's VNE (never exceed speed) in KIAS <mach-limit> Mach speed limit. <alt-threshold> altitude at which these figures were calculated. Note : <mach-limit> is the mach limit at <alt-threshold> This was designed for indicated airspeed limits, but could probably be extended for mach limits. To initiate additional airspeed indicators, add in your instrumentation file (for airspeed indicator index 1): <airspeed-indicator> <name>airspeed-indicator</name> <number>1</number> <total-pressure>/systems/pitot[1]/total-pressure-inhg</total-pressure> <static-pressure>/systems/static[1]/pressure-inhg</static-pressure> <has-overspeed-indicator>0</has-overspeed-indicator> </airspeed-indicator> Note: this airspeed indicator sources its pressures from the second pitot and static system (with index 1). and in the aircraft -set file: <airspeed-indicator n="1"> <serviceable type="bool" archive="y">true</serviceable> </airspeed-indicator> And if "has-overspeed-indicator" = 1, the appropriate limits as explained above in the airspeed-indicator brackets.