Ah, yes you are right Don. Thanks!
I'm still interested in the 12028 suggested previously here Jerry. It was $20 at O'Reilly's or Autozone or Summit. That number happened to be what Harley would describe as the short version of the three it offers for the 07-09 bikes. But if worst came to worst with a poor running bike in some little town somewhere a guy could extend some wire leads.
It was also interesting to read in Mastertune's documentation that the 05-06 ECMs worked with the o2 sensors. Just requiring an appropriate matching map to be loaded. Leads to the assumption that the system was in development by HD at least immediately prior to 05 for them to have started rolling out at least the nascent capability inside the 05 ECMs.
Still can't help but be amused, however, that for a (by Harley standards) "modern" engine monitoring system they deliver to riders in 2007 they deploy sensor technology that GM (not itself a paragon of modernity in the 1980s) rolled out in 1979 and had generally moved beyond by the mid 80s. Hey, at least we don't have to regularly grease speedometer cables at the wheel anymore....