Indoor car shows can be tricky. I've been to a couple with really crappy lighting and some with decent lighting. IMO, the only thing you can really do is bump up your iso and use noise software later if you need to. Luckily the d90 has a good sensor for that. I use the Nikon 17-55 f/2.8, and Sigma 70-200 f/2.8 hsm.