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GaugeFace is an iPhone app that allows me to monitor cylinder head temp, Air Fuel Ratios, Manifold Air Pressure, Throttle Position and even check engine codes all directly from the bike's computer (ECU). Here is a screenshot of one skin from the app. There are many more that show different information. I use it mostly for Cylinder Head temp. I really like it. I think this app is just scratching the surface of it's potential. I foresee future updates that provide even more.
Have had work going on for a while now to test/prototype support for Android on the hardware side... no near term timeframe to share as of yet however.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.