ok, then, if you don't mind, i'd like to hijack for a bit.
here's the link to the dyi to install a cayman wart:
Bold Mod- Custom Sport Chrono Pod with Multi Gauge - 6speedonline.com Forums
doing some research, and harry's iphone lap timer *I think* can process Bluetooth video, obd2 and gps data.
so, get a used cayman wart and install a Bluetooth gps and hd webcam in it. get a Bluetooth obd2 reader and wire it all up. as soon as you get in your car, the app should be getting all the info it needs to work, all while sitting in your coat pocket (or console storage or wherever).
further, it looks like the harry's lap timer app has the ability to share data realtime with other devices. if we could find a way to share data with a plx multigauge (also installed in the cayman wart) then you could see your lap times, split times, lateral g's, etc., while driving. all in once package.