This is usually an xml gauge that is controlling things. This is how I did what you want to do. Download DSB Design's Typhoon from
here and open the folder called " gauges". Inside that you'll see a folder called "dsbxml". Move that WHOLE folder (the one named "dsbxml") into you FS9 gauges folder. This folder has the gauge that will be controlling the afterburner effects on the models you want to add the automatic burner control to.
Next open the panel.cfg of the Typhoon and look for the following (near the bottom):
[Vcockpit01]
Background_color=0,0,0
size_mm=256,256
visible=0
pixel_size=256,256
texture=$hud
[glow=yellow,2,300]gauge00=DSBXML!DSBAburner,