How to make this Master Script work?

When a player touches temp his leaderboard will change to the value of temp, if a player touch tamp theirs will change to that value.

Why in one script? Less lag.

Temperature (Model) > MasterScript > TAMP (part) > TEMP (part)

local ting = 0

function onTouched(hit)
	if ting == 0 then
	ting = 1
	check = hit.Parent:FindFirstChild("Humanoid")

	if check ~= nil then

		local user = game.Players:GetPlayerFromCharacter(hit.Parent)
		local stats = user:findFirstChild("leaderstats")

		if stats ~= nil then
			local cash = stats:findFirstChild("F")
				if cash.Value >= 0 then 
				cash.Value = cash.Value == 23
				end
			local cash = stats:findFirstChild("C")
				if cash.Value >= 0 then 
				cash.Value = cash.Value == ("-5")
				end
			script.Parent.TAMP.Touched:connect(onTouched)
		end
		
		if stats ~= nil then
			local cash = stats:findFirstChild("F")
				if cash.Value >= 0 then 
				cash.Value = cash.Value == 34
				end
			local cash = stats:findFirstChild("C")
				if cash.Value >= 0 then 
				cash.Value = cash.Value == 1
				end
			script.Parent.TEMP.Touched:connect(onTouched)
		end
	end
	ting = 0
	end
end

These are all of your problems with this script:

1.

:findFirstChild() is deprecated, use :FindFirstChild()

2.

To change the value of a number:

local cash = script.CashValue

cash.Value = 1 -- changes the value
cash.Value = cash.Value + 1 -- adds 1 to the value
cash.Value = cash.Value - 1 -- takes away 1 from the value
cash.Value = cash.Value * 2 -- multiplies the value by 2
cash.Value = cash.Value / 2 -- divides the value by 2

3.

To make sure something is a player:

script.Parent.Touched:connect(function(hit)
	local p = game.Players:GetPlayerFromPlayer(hit.Parent) -- an npc can have a humanoid
	if p then
		-- code
	end
end)