There is a fairly-new thread that may answer your questions about how the gauges will look, Cube_999. It is called "New pics: highly recommended," or something like that. The first page alone has the pictures you are looking for. And while you're at it, be sure to thank Amar_212 of Croatia for the hard work in getting those pictures to GTPlanet.
I think for newcomers, it is HIGHLY recommended to do a search before devoting an entire thread to the topic at hand. Cube, this isn't a dumb topic you've created. This is actually an interesting one. Anything related to Gran Turismo 4 that isn't "will _____ be in GT4" is an interesting one. I've created several topics discussing as many aspects of the upcoming game as possible. Either take a look at them and reply later, or create your own based on information you've read from others. But yeah, a Search is a good idea first, especially for newcomers. And I can understand why you don't want to search through lots of pictures. But you're kind of better off searching anyways, just in case. Okay? Take care, Cube!