Drag mouse and achieve value between -1 and 1

Help and Feedback Scripting Support
#1

Hey guys, my goal here is to make a part that you can drag back and forth, which will return a value between 1 and -1, and will then give propulsion to a vehicle. My issue here though is that I cant figure out the math to reach the value, it never makes it to positive 1 and decides to go back down.

I don’t really know how to explain it, so I will attach a video of what I mean.

https://gyazo.com/646b1e86dfcf053397b3eb1e1d1c02e3

If someone can take a look and provide me some feedback, here is the code.

local user = game.Players.LocalPlayer
local mouse = user:GetMouse()
local isDragging = false


local camera = workspace.CurrentCamera

local params = RaycastParams.new()
params.FilterDescendantsInstances = {}
params.FilterType = Enum.RaycastFilterType.Exclude 

local function rayResult(x, y)
	local unitRay = camera:ScreenPointToRay(x, y) 
	return workspace:Raycast(unitRay.Origin, unitRay.Direction * 500, params) 
end

local UserInputService = game:GetService("UserInputService")

UserInputService.InputChanged:Connect(function(input)
	if isDragging then
		local ray = rayResult(mouse.X, mouse.Y)
		if ray.Instance and ray.Instance.Parent.Name == "Interactive" and ray.Instance.Type then
			local Type = ray.Instance.Type.Value
			if Type == "Drag" then
				local screenPos = camera:WorldToScreenPoint(ray.Instance.Position)
				local screenPosVector2 = Vector2.new(screenPos.X, screenPos.Y)
				local mousePosition = UserInputService:GetMouseLocation()
				local distance = (screenPosVector2 - mousePosition).Magnitude
				local part = ray.Instance
				local MIN = -part.Size.Z/2
				local MAX = part.Size.Z/2
				print(math.clamp(MIN + (MAX - MIN)*(1-(distance/50)), -1, 1))
			end
		end
	end
end)

UserInputService.InputBegan:Connect(function(input)
	if input.UserInputType == Enum.UserInputType.MouseButton1 then
		isDragging = true
	end
end)

UserInputService.InputEnded:Connect(function(input)
	if input.UserInputType == Enum.UserInputType.MouseButton1 then
		isDragging = false
	end
end)

Thanks!