If you want absolute accuracy and affordabilty get the mpguino. If you want features and to be able to watch other sensors (which is quite important) get a scangauge. The kiwi is a 'neat' gadget, but its slightly inferior to both of the other two if you really want a good tool. I wrote up a review of it on our blog. Do a search for kiwi there and I'm sure you'll find it.
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