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Originally Posted by 80stech
That looks really cool! I was going to build a similar hard wired device using an arduino and put in the ashtray like that! I even found a small orange display (not easy) but it isn't readable in daylight!
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I believe the UltraGauge comes with a blue backlighting and needs some colored film to get the orange to match our gauge colors. Here is a good description of how one of the guys over on ZHPMafia did it.
UltraGauge OBDII Gauges