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The elm327 bluetooth for less than 20$ on ebay is great, torque app for android has a nice display and gives you lot of information. Some drawback you've got to start the app everytime you start the car, and there's no real way to do a real calibration. Search a bit on the forum because there's someone that did a nice review of it last year.
Scangauge is best in my opinion because you just install it and it's starting up automaticaly! there's way to calibrate it to your car...
Btw you should go for the ''real'' scangauge instead of the scangauge-e as it can display 4 things at once!
If you're on a budget look out the ultra-gauge, it's cheaper than the scangauge-e and shows 6 gauge at once.
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