I use a Scangauge, but it too has issues with overheating in the Texas sun.
I use a windshield reflector when I park. That handles any daily driving issues just fine. If I'm driving long distances, I'll put a folded paper thing over top of it for shade.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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