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> <total-pressure> is optional --- defaults to "/systems/pitot/total-pressure-inhg" <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 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.