Universal Speedometer

-- Speedometer Script V3 (Fixed)

local Players = game:GetService("Players")
local RunService = game:GetService("RunService")

local player = Players.LocalPlayer
local character
local humanoidRootPart

local useMPH = false

local function setupCharacter(char)
	character = char
	humanoidRootPart = character:WaitForChild("HumanoidRootPart")
end

if player.Character then
	setupCharacter(player.Character)
end

player.CharacterAdded:Connect(setupCharacter)

local screenGui = Instance.new("ScreenGui")
screenGui.Name = "SpeedometerGUI"
screenGui.ResetOnSpawn = false
screenGui.Parent = player:WaitForChild("PlayerGui")

local frame = Instance.new("Frame")
frame.Size = UDim2.fromOffset(170, 160)
frame.Position = UDim2.new(0.5, -85, 1, -190)
frame.BackgroundColor3 = Color3.fromRGB(25, 25, 25)
frame.BorderSizePixel = 0
frame.Parent = screenGui

Instance.new("UICorner", frame).CornerRadius = UDim.new(0, 16)

local speedLabel = Instance.new("TextLabel")
speedLabel.Size = UDim2.new(1, -10, 0.6, 0)
speedLabel.Position = UDim2.new(0, 5, 0.05, 0)
speedLabel.BackgroundTransparency = 1
speedLabel.TextColor3 = Color3.fromRGB(255, 255, 255)
speedLabel.TextScaled = true
speedLabel.Font = Enum.Font.GothamBold
speedLabel.Text = "0 KM/H"
speedLabel.Parent = frame

local toggleButton = Instance.new("TextButton")
toggleButton.Size = UDim2.new(0.85, 0, 0.25, 0)
toggleButton.Position = UDim2.new(0.075, 0, 0.7, 0)
toggleButton.BackgroundColor3 = Color3.fromRGB(45, 45, 45)
toggleButton.TextColor3 = Color3.fromRGB(255, 255, 255)
toggleButton.TextScaled = true
toggleButton.Font = Enum.Font.GothamMedium
toggleButton.Text = "Switch to MPH"
toggleButton.Parent = frame

Instance.new("UICorner", toggleButton).CornerRadius = UDim.new(0, 12)

toggleButton.MouseButton1Click:Connect(function()
	useMPH = not useMPH
	
	if useMPH then
		toggleButton.Text = "Switch to KM/H"
	else
		toggleButton.Text = "Switch to MPH"
	end
end)

RunService.RenderStepped:Connect(function()
	if not humanoidRootPart then return end
	
	local velocity = humanoidRootPart.AssemblyLinearVelocity
	local studsPerSecond = velocity.Magnitude
	
	local kmh = studsPerSecond * 0.28 * 3.6
	local mph = studsPerSecond * 0.28 * 2.23694
	
	if useMPH then
		speedLabel.Text = string.format("%d MPH", mph)
	else
		speedLabel.Text = string.format("%d KM/H", kmh)
	end
end)