Why do I emphasize time? For ecological reasons.
Why am I still harping on about the palm? I think it is a terrific reuse opportunity. It's a great little device that deserves better than the landfill. I've had a few and never paid for one of them. Here is a site with one mounted on a motorcycle (and other places):
http://www.conklinsystems.com/palm/pwh/ . And I'm going to be writing the above gui screen for the palm when my elm323 adapter shows up anyway.
Its about twice as wide and half as thick as a scangauge and the same length, so it shouldn't be a real challenge finding a spot to mount it.
I have no problems with an integrated display solution for a future version if the palm supply looks like it is going to dry up of course.