GaugeFace For iOS

Have iPhone, have sportster, will ride... Got to get one of these!
Cost about $260 (msrp) and adds tons of functionality left off stock Sportsters.

Installation is easy

1. Plug into your Harley-Davidson motorcycles data (diagnostics) port. 
2. Tuck the GaugeFace® Hardware Adapter under your seat or secure it elsewhere. Run the iPod cable up to your handlebars and make sure not to run it on the same side as your spark plugs. Use zap straps to ensure the iPod cable is secured. 
3. Use a mount of your liking (not included) to hold your iPod touch or iPhone and plug the GaugeFace® iPod connector in.

Check out GaugeFace.com for more info.