Sorry for taking so long to reply to this post. I just saw it this morning.
So here is what I can say about the scan Gauge III. It seems to have held up in the summer sun and heat mounted to the inside of the windshield just fine. It turns on automatically every time I start the car. I have also used it in two other cars and it works very well. The touch screen is bright and easy to see. You can customize the displayed gauges and colors for the screen. I like it, to me it was worth the money and I'd buy it again.
...But yes, it's kind of expensive....
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