I have been driving Betsy with my phone sitting in the ashtray running the app "Android Speedometer" so I have an idea how slow I'm going (notice I didn't say how "fast"). My speedometer is way off, so when I'm doing 35, my speedometer says I'm doing 20...
Anyway, for Fathers Day my daughter got me a Nite Ize Steelie
which I stuck in the middle of the dash. The mount location allows me to see the phone display easily and plug into the power socket (thanks again Bob) without having the cord interfere with anything (like the shifter).
And since I uploaded all my iTunes to the Google cloud, I can use my phone as a speedometer AND a sound system.
Here's a few pics...
The steel mount stuck to the dash
The phone has a very strong, small, concave magnet stuck on the back. The concave shape allows it to be positioned anywhere on the steel ball.
This blurry shot shows the power cord plugged in.
And the view from the driver's seat. I'm going really slowly inside my garage...
I also have some portable speakers which I will try later to enhance the music from the phone.