Ultra-Gauge...

http://www.ultra-gauge.com/ultragauge/index.htm

I stumbled on this on another forum. I picked one up for my Ecoboost so that I could use it for a boost gauge. It's really an all in one type tool. It could be used for 1/4 times, HP, Torque, rev limit alarm and trouble shooting codes. Fully customizable and has several pages of gauges. Well worth the price. Requires OBD 2.

Picked one up for my VW TDI. Still working on getting it mounted to be easily seen while driving. Seems like a fairly versatile tool, and very reasonably priced.