As far as I can tell, you add the gauge03=CSWeapon!hud3d, 526, 515, 550, 550 like that, then you use the collimation data in the CSWeapon.xml file to get  the size right in the VC.

I changed the size of the CSWeapon!hud3d, 526, 515, 550, 550, to match the oe in the Iris F-14 gauge00=CSWeapon!hud3d, 13,12,1000,1000 and the CSWeapon 3D HUD was huge. That's why I came to the conclusion that the HUD size in the VC must stay the size that the SDK says it should, and the collimation data is what is used to adjust its size. FOV could come into play once I get the size right. But it isn't easy.

Hope this helps.

Mark