Kismet - Damage Threshold - Texts on the screen

I made a turret with kismet, and I connected a take damage to it so the player can kill it. The damage threshold is on 500. I would like to show to the player somehow that how much hp the turret has. Is there a way to get out how much value remained from the damage threshold? After I got this value, I would like to write it out to the screen. Or the better would be that if I could write it above the turret. Is there a way for doing this without Scaleform? If no, then I would like to make it as the turret hp appears on the screen just when the player is close to it. I already have a trigger to turn on the turret when I'm close.

Thanks!

Link to the next questions:
http://www.polycount.com/forum/showthread.php?p=2052446#post2052446