An operator who is subject to this chapter shall place instructional signs in conspicuous locations at each gasoline dispenser. The instructional signs shall include: Instructions, with illustrations, on how to insert the nozzle, dispense gasoline, and how to remove the nozzle; A warning against attempts to continue refueling after automatic shut-off of the gasoline (that is, topping off); and The Department's toll-free telephone number which may be used for complaints or comments concerning the use of Stage II vapor recovery systems.