I have my Scangauge mounted on a recycled iPod gooseneck. I removed the iPod mount and 12v adapter from the ends of the gooseneck. I attached the gooseneck to the Scangauge with a screw from the back of the Scangauge tapped into the 90 degree fitting on the gooseneck. I used a scrap right angle at the bottom of the gooseneck and tapped into the side of the left cubby with 2 screws.
From the driver's point of view it's just below the line of sight to the left of the steering wheel. I don't have to bring my eyes that far from the road to read the gauge.