[dcb]

A mega168 vacuum effort, done right, would need some code space. You can always gut out the code you don't like to make room (someone should start a code tweaks wiki) but given that it complicates hookup, and there is precious little code space left with the current arrangement, I doubt it would ever be "core" on the base unit.

You do want to update the bar graph as often as possible, so it looks "analog" not just once per 1/2 second, so the whole program might need redoing to do more than one thing at a time with it. There are a couple analog ports available (analog 1 and 2), might just want to build a second one for vacuum/wideband o2/???