I saw one not too long ago. Works really well, but expensive and takes up a lot of space. The standard kit just reads RPM and speed. You need another sensor to monitor boost and other parameters. The "fish" function is pretty cool, however.

More info: http://hksusa.com/categories/?id=1082&rsku=0

I was going to get it from www.gruppe-s.com - They told me the price was 20% less than what was on HKS's site. They don't have it on their web site, but they can get it, so you'll have to e-mail them about it.