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BTDT, mine died after a few months, that could have been my fault. I set it to sleep when the car was off to prevent battery drain, it never woke up. Before it's demise it paid for itself in time spent chasing codes. The torque App is very nice, it works with many BT devices and gives you many more options for what info is displayed than Scangauge.This is a great little device for $10. It stays plugged in all the time and it's completely out of the way.
http://www.amazon.com/gp/product/B00ARAQHGE?psc=1&redirect=true&ref_=oh_aui_detailpage_o05_s00
I am pretty sure it does everything the above dedicated units do only it displays OBD data real time to your cell phone (not a dedicated device) via an app called Torque.
You can build your own dashboards in the Torque app so I have various temp gauges on one screen then another screen for real time stats. You can also scan for codes, historical codes, shadow codes, etc...
Plus it's super easy to plug into other vehicles when needed and is totally out of sight, out of mind till you pull up the app (communicates with the dongle via BT).
ScangaugeII or Ultragauge for OBD2 stuff. Techstream for most everything else. Do a search for more info on these products.
http://www.scangauge.com/products/scangaugeii/
http://www.ultra-gauge.com/ultragauge/
BTDT, mine died after a few months, that could have been my fault. I set it to sleep when the car was off to prevent battery drain, it never woke up. Before it's demise it paid for itself in time spent chasing codes. The torque App is very nice, it works with many BT devices and gives you many more options for what info is displayed than Scangauge.