Car longer deregistered, on which way to get TÜV?

Hi people I have here a car that has been registered a little over 6 years, and I want to demonstrate this to the TÜV. How do I go there before ? Double card of the insurance and then to the TÜV driving ? Short-term license plate ? Or to the TÜV to pull (towing) The devalued license plate are still available. Thank you !