I'm selling mt Dragy GPS as I feel I've learned what I wanted to from it. I measured performance before and after fitting a lighter flywheel. Check out their website for more info www.dragymotorsports.co.uk New is £145 Looking for £100 posted to the UK. It comes boxed, with all original kit, ready to go. Monitor your 0-60mph, 60-130mph, 100-200kmh, 1/8 mile, 1/4 mile, 1/2 mile performance, and more! Dragy uses high speed GPS satellites to accurately measure your vehicles performance within 1/100th of a second. The Dragy software automatically charts slope on all timeslips which you can then post to forums or social media, share with friends, or even upload to the Dragy leader board. The Dragy box is extremely compact at 1" x 3" (25.4mm x 76.2mm) and can be set on the dash when testing and stored in the glove box or center console when not in use.