RealCRT Top Avionics gauges are developed by Tony D'AMBROSIO.
http://perso.wanadoo.fr/tony.dambrosio/index.htmGo to
www.flightsim.com file library and do a search for nd2k_13.zip. This is a required database/route program. Flight plans can be imported from FS. With the Real CRT gauges the flight plan is loaded though the FMC, not GPS. I'm not 100% how this works because I'm still learning, I think you load the plan into both the FMC and GPS, then you can get clearances and use the RealCRT gauges to fly the route.
Download a panel with the RealCRT gauges, then go to
http://www.reg.net/product.asp?ID=2524 to register. I think it's $17. Look at the nav data program registration window and write down the serial number, you need that to register. Fill out the registration then when you get your key code go back to the nav data register page and fill it out.