In conjunction with MigBuster's Tutorial (http://forum.combatace.com/index.php?showtopic=44026) on conversion of older series aircraft to the TEWS system, it's briefly mentioned that right then custom .tga files aren't able to be done. Well with help from Fubar512, it's actually pretty simple. Since we're all trying to grasp new technologies and new ways of doing things, here's how to add a custom .tga to your TEWS RWR:
1. First create a "Flight" (if you didn't from the above tutorial) in User\Saved Games\Thirdwire\SF2 Game folder.
2. Go through the above tutorial and create your RadarFamilyName, and since I just did it, the RDY radar for the Mirage 2000D, naming it "RDY"
3. Use the little template .tga that can be downloaded (just below the text) and in either Photoshop or Paint Shop Pro, edit the Alpha channel, putting "RDY" in the center of the box. It's preferred to use small fonts (14 is a good size) as the game engine will resize it on the RWR display.
4. Save the .tga file as 32-bit and name it "RWR_RDY.tga" and save in the Flight folder. Ensure your "xxx_RWR.lst" has this:
RDY=RWR_RDY.tga
5. Save and when your aircraft detects the RDY, "RDY" will be displayed as appropriate on your RWR screen.
RWR_RDY.zip