Quoted from Snyyppis

for custom crosshairs at least you can add a damage indicator, for instance I have:

event DamagedPlayer
{
Animate xHairCustom FgColor "255 0 0 255" Linear 0.0 0.00001
Animate xHairCustom FgColor "255 255 255 255" Linear 0.2 0.20001
}

in my scripts/hudanimations_tf.txt (crosshair pulses red on hit)…

This doesn’t work ;( Are you sure there isnt more to it, say something in hud_layout, or something similar?