I decided I didn't like stuffing the gauge in the cubby to the left of the steering nacelle. The spot I decided I like best is right below the switch panel (hazard, etc.) but the sticky velcro Scangauge provides was not going to work on the fabric covered plastic. I do not want to drill any holes, so here is what I devised:
http://home.everestkc.net/ckigar/scangauge.JPG
The silver discs are super strong rare earth magnets stuck on to the gauge with 3M double sided mounting tape. The mates to the magnets are on the other side of the panel, easily accessible by popping the switch panel out. The magnetic force is more than adequate to hold the gauge in position while using the buttons.
If you try this, exercise caution when handling the magnets as they can snap together with a hazardous amount of force. The ones I purchased were packed with separators.