How do I make a GUI appear when a player is sitting on a seat?

hi

plr = game.Players.LocalPlayer
char = plr.Character or plr.CharacterAdded:Wait()

if char.Humanoid.Sit == true then
    urGui.Enabled = true
end

Hello there.

I will provide you with a script. In order to make it work, you need to put the script inside the seat, and the GUI inside the script.

If you have any further questions, feel free to comment or message me.

local seat = script.Parent
local guiName = "TestGui"
local gui = script:WaitForChild(guiName)
local Players = game:GetService("Players")
local lastplr 

-- each time the Occupant property of the seat fires...
seat:GetPropertyChangedSignal("Occupant"):Connect(function()
    if seat.Occupant ~= nil then
        local char = seat.Occupant.Parent
        local player = Players:GetPlayerFromCharacter(char)
        local cloned = gui:Clone()
        -- cloned.TrainName.Value = script.Parent.Parent.Parent.Name
        cloned.Parent = player.PlayerGui
        lastplr = {player, cloned} -- store player and Gui in array
    else 

        print("player left")
        if lastplr then -- verify lastplayer is not nil
        lastplr[2]:Destroy() -- since the table's numerically indexed, we know lastplr[2] will be the Gui
        lastplr = nil
     end
  end
end)

-- Credit for code goes to XxELECTROFUSIONxX