Yeah its the AEM UEGO Wideband AFR gauge I have fitted.
Boost and fuel pressure is what I was thinking, along with oil temps. - Your right though, I would probably get bored with it. That's why I don't mind spending £30 on it.
You don't really require oil temp.
So a twin pod in the R/H pillar with a boost and fuel pressure gauge would be suffice and quite subtle.