Just cause I was searching...
My 1200GS came with the smartire tpms. Fookin' awesome. I absolutely loved that thing. And now that I'm running tubed tires I've got to get use to not having it. They aren't being made any more for motorcycle applications, but I came upon an ebay seller who must have found a lost shipping container with them. Needless to say, for $99 shipped you can get a tpm for your bike.
In 2.5 years of using the system it was always spot on when referencing manually. The smartire also does temp calibration.