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I have a 10 dollar Ebay bluetooth one that I use with Torque on my phone (I have the 5 dollar full version, worth it), and an OpenFlash Tablet which I got for flashing my car, but it also can be used to display info from the car.
The cheap bluetooth adapters have a very slow refresh though, but it's hard to say which ones will perform better. I haven't looked into it.
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