How to put tool on the player's head?

Hello! I would like to know what is wrong in my code, I want the night vision tool to appear in the player's head, how can I do that?

local tool = script.Parent
local equipped = false
local UID = game:GetService("UserInputService")

local player = game.Players.LocalPlayer
local char = player.Character
tool = char.Head.CFrame


tool.Equipped:Connect(function()
    equipped = true
end)

tool.Unequipped:Connect(function()
    equipped = false
end)

local isActivated = false

UID.InputBegan:Connect(function(key,isTyping)
    if equipped == true then
        print("tool equipped")
        if key.KeyCode == Enum.KeyCode.N then
            isActivated = not isActivated
            if (isActivated) then
                pcall(function()
                    local StarterGui = game:GetService("StarterGui")
                    StarterGui:SetCore("TopbarEnabled", false)


                end)

                local frame = game:GetService("Players").LocalPlayer.PlayerGui
                print("Activated.")
                -- Config 1
                wait(.1)
                frame.Screen:FindFirstChild("NightConfig").BackgroundTransparency = 0.1
                wait(.1)
                frame.Screen:FindFirstChild("NightConfig").BackgroundTransparency = 0.15
                -- Config 2
                wait(.1)
                frame.Screen:FindFirstChild("NightConfig").BackgroundTransparency = 0.25
                wait(.1)
                frame.Screen:FindFirstChild("NightConfig").BackgroundTransparency = 0.4
                wait(.1)
                frame.Screen:FindFirstChild("NightConfig").BackgroundTransparency = 0.6 
            else    
                pcall(function()
                    local StarterGui = game:GetService("StarterGui")
                    StarterGui:SetCore("TopbarEnabled", true)
                end)
                local frame = game:GetService("Players").LocalPlayer.PlayerGui
                frame.Screen:FindFirstChild("NightConfig").BackgroundTransparency = 1
                print("no activated.")
            end
        end
    end
end)