Anyone live near North Ridgeville, Oh? There's a manufacturer (Aeroforce Tech) that is making a 52mm gauge with capabilities like the Scangauge (they say it will have more features) plus it looks better and will fit into a standard gauge pod. They need a local tester vehicle. It has to be a newer 4.0L. You have to be able to stop by the shop for install and then again at a later date so they can check it out. They're giving a free gauge for your trouble.
You can check it out here (PM Todd on their forum for details):
Here's a video of their gauge on another vehicle (they're available in different colors):