tank.lua

sideTank = "right"
delay = 5

myTimer = os.startTimer(1)

while true do
  local event, timerID = os.pullEvent("timer")
  if timerID == myTimer then
    term.clear()
    term.setCursorPos(1, 1)

    if peripheral.isPresent(sideTank) == true then
      local tank = peripheral.wrap(sideTank)
      local info = tank.getTankInfo(sideTank)
      local data = info[1]

      if (tostring(data['rawName']) ~= "nil") then
        --print(tostring(data['rawName']).." ["..tostring(data['name']).."] ("..tostring(data['id'])..")")
        --print(tostring(data['amount']).." / "..tostring(data['capacity']))
        print(tostring(data['amount']).." / ")
        print(tostring(data['capacity']))
      else
        print("Empty!")
      end

    else
      print("Empty!")
    end

    myTimer = os.startTimer(delay)
  end
end