Installing Aircraft after download

Hi folks, sorry if this is in the wrong place or has been asked a million times before, but I am new to this game (installing aircraft that is). *grins*Basically I read a review for the new A320-200 in and decided it looked great so downloaded it.The problem I have is once I download it, I can't seem to install it properly.Some how I have managed to get the actual aircraft in place, but the cockpit guages are a standard 2 engine jet layout. I didn't fancy messing about with the FS Guages folder too much. Also I get messages telling me that FS can't use the 3rd party gauges .gau files.Probably as I said I have installed the thing wrong.I am using FS2002 standard not pro edition, and having read a few bits see that GMax is required. Well I have now DL that too, but still no joy.Also I downloaded the Airbus A300-600ST