ReadTank

component = require("component")
term = require("term")
local sleepTime = 0
sides = require("sides")
colors = require("colors")
rs = component.redstone
tank = component.tank_controller


tInfo = tank.getFluidInTank(sides.west) -- Tank is above the Adapter


amount = tInfo[1].amount
capacity = tInfo[1].capacity
label = tInfo[1].label

percent = (tInfo[1].amount / tInfo[1].capacity) * 100


math.floor(percent + 0.5)


-- Output as you want... a very simple way:
  if percent == 100 then
    rs.setBundledOutput(sides.up,colors.white,255)
  else
    rs.setBundledOutput(sides.up,colors.white,0)
  end

  if percent < 95 then
    rs.setBundledOutput(sides.up,colors.purple,255)
      term.clear()
      print("Fuel Type: "..label)
      print("Amount   : "..amount)
      print("Tank Cap.: "..capacity)
      print("% Full   : "..percent)
    os.sleep(5)
  return

  else
    rs.setBundledOutput(sides.up,colors.purple,0)
      term.clear()
      print("Fuel Type: "..label)
      print("Amount   : "..amount)
      print("Tank Cap.: "..capacity)
      print("% Full   : "..percent)
    os.sleep(2)
  return
end