keep in mind, the Defi's don't come smaller than 60mm. I almost bought something I couldn't use because of that. You can try to get smaller gauge pods, but it'll take a little customizing to get them to fit. Also pay attention to the depth of the gauges, I had one minor issue involving that as well. Another one: the cord lengths! The cords you use to daisy chain only come in certain lengths, so make sure you get what you need for your install. I put my boost gauge on my steering column, since I deemed that the most important of boost, oil temp, oil pressure, and fuel pressure. They only come in Metric units (as of when I bought them) but I doubt that will be an issue for you. I see on their website they come in Imperial or Metric now...
Oh, and there's only so much subtlety about these, unfortunately. At night time they are well lit, but the illumination is adjustable. They are quite visible from outside even with tinted windows.
EDIT: I see now they have blue models on their website! I so wanted blue before! They only had white before. Damn! Double Damn! Combined with Imperial versions.... Ohhhh, I shouldn't have looked at that site...