I put mine on the dash, just to the left of the main instrument panel (note, reverse left and right if you drive on the right, as I am from the UK!). This is where the MPG meter is on some other cars I drove, so I am happy with it there. When I permanently mount it, it will have velcro on the bottom, so I can stick it there when I drive and put it in the glovebox when I am parked.
__________________ Team GasMisers5 - #1 for first three rounds of the original GS Fuel Economy Challenge
Miles displaced by e-bike since 1 Jan 2008: 62.6 (0 kWh used)