For a moment you had me excited, I've been looking for something with a pinout for the Insight ECU so I can try to hack it for better economy and perhaps more liberal use of assist.
Unfortunately, they do mention that it won't work on turbo models, which is a shame as I was considering purchasing a nice Turbo Insight last night when I was asleep.*
The item also has the most precise location I've seen on an eBay ad. Apparently the seller keeps it on his or her person at all times.
It also says only $3.99 for me. Now that's a deal. Unfortunately, since it's for a Honda "Element Insight" and it says it won't work on any other car, you've probrably got about a 50 percent chance that it will work on the Insight.**
* Dreaming, in case it wasn't obvious.
** Does not include the possibility that it will not work at all.