You'll like the programmable fuel gauge, I have a full set of Elites in my regal (I splurged last summer), and the programmable feature is neat, even better with the speedo. The elites look about the same, but the background can be programmed to change to one of 7 colors at any points you wish to warn you of things, basically the entire gauge is an idiot light as well as a gauge. The entire tach even changes colors when I get to my shift points. You can have it change in stages but I think that could just be distracting, the RPMs climb so quick you better shift right away anyway.
The only downfall of a 270 degree sweep fuel gauge instead of 90 degree sweep is it makes it seem like you use a lot more gas! Because the needle moves so far you can darn near watch it move. I'm exagerating but you'll see what I mean.
How are you mounting them? Getting a blank panel from ION? Or fabbing something?