I use the ScanGuage II on my Vibe, and I love it. Before, I tried my GM ODBII interface and it didn't work on the Vibe, so it will need to be Toyota compliant. Interestingly, this Interceptor specifically excludes Toyota, so I would be concerned about that. I don't see a price on the site. This Interceptor only displays two parameters at a time, I have a hard time limiting my 4 options on the Scan guage II. Interestingly, this Interceptor lists some transmission data like temp, and Horsepower is a cool feature.
I would love to change the world, but they won't give me the source code
I've seen it, but never tried it. More expensive than the ScanGauge, IIRC.It has performance features (0-60, 1/4 times) that the SC2 doesn't have, but it doesn't have the trip/mileage management features that the SC2 has.