Minecraft: Immersive Engineering Silo Fullness Thing

-- configuration --
local siloSide = "back"
local wait = 5
-- configuration --

local monitor = peripheral.find("monitor")
monitor.setTextScale(2)
quit = false
while not quit do
    if monitor then
        monitor.clear()
        monitor.write(rs.getAnalogInput(siloSide))
    end
    sleep(wait)
    local event, key, isHeld = os.pullEvent("key")
    if event then
        quit = true
    end
end