well the current version is part of the cockpit script im (slowly) working on. i think i may have posted an old version to the scripting board. its really not that hard to do. once you determine where to draw the lead indicator, you subtract the center of the screen from it, then you add that vector to the center of the screen. or something like that. my cockpit script is much more complicated because i require a reference point in space that is projected to screen coords to use as a center screen coords, in cases where the centerof the screen is not necissarily forward (when using track ir for example.)