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Title: Does not work if it gets too cold!
Review: I bought 3 of these for Xmas gifts. The problem is that they do not power on at cold temperatures. I left all 3 in my car overnight in late December and all 3 failed to power on until they were brought inside and allowed to warm up. This is a huge problem here in Michigan where it sometimes stays below freezing for 2-3 months a year. As far as I'm concerned, they are almost useless as I don't think I should have to keep them in a heated environment. This negates the convenience of having a digital gauge.
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