Gui not appearing when brick touched?

GUI = game.ReplicatedStorage.Radar.radar
local Part = script.Parent

Part.Touched:connect(function(HIT)
 local H = HIT.Parent:FindFirstChild("Humanoid")
 if H then
  local Player = game.Players:GetPlayerFromCharacter(HIT.Parent)
  if Player == game.Players.LocalPlayer then
	game.PlayerGui.Radar.radar.Visible = true
	-- Radar is a screen GUI
	-- radar is a frame
end
 end
end)?

Okay, I'm pretty sure this will work, but fix your GetPlayerFromCharacter() to look like this:

 local Player = game.Players:GetPlayerFromCharacter(HIT.Parent.Name)

script.Parent.Touched:connect(function(hit)
if hit.Parent.Humanoid then
	local Character = hit.Parent
	local Player = game.Players:GetPlayerFromCharacter(Character)
	local PlayerGui = Player.PlayerGui
	local Gui = PlayerGui.Radar
	local Frame = Gui.radar
	Frame.Visible = true
end
end

Hope this helps

If your trying to make a Frame visible then just access the PlayerGui;

Make sure this is a script, not local script

local part = script.Parent

part.Touched:Connect(function(H)
	local pg = H.Parent:WaitForChild("PlayerGui")
	local frame = pg:WaitForChild("Radar").radar
	wait()
	radar.Visible = true
end)

You don't need some stuff,

if this helped please accept answer :D