How do I make the following script a remote event? (If i said that in a way to understand)

This is a server script:

local humanoid = script.Parent.Humanoid
local damage1 = script.Parent.DamageInd.Smoke

humanoid.HealthChanged:Connect(function(health)
    if health < 1000 then 
        damage1.Enabled = true   
end
end)

I want the gun used to take the Humanoid's Health to change on the server, so the Smoke can enable if i shoot it under the desired amount of health (which is the 1000).

THIS IS NOT THE GUN SCRIPT.

The gun script is long, so i'll only post it when requested, if you're up to the challenge to make that work with this.