I had been wanting something to read engine codes, and I had also been looking at standalone transmission temp gauges...Instead of buying two different units and then installing the temp gauge and routing cable and power, instead I bought a Scangauge2.

Easy to hookup and velcro (or sticky-tape) to the dash, and with just a little bit of time spent programming a few numbers, its reading transmission temps, air temps, coolant temps, trouble codes, (none) and mpg along with several other pieces of information.

Well worth the money for me.