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Kinda bringing this topic back from the dead, but I thought of the exact same thing (using a MAP to gauge load) just minutes before I decided to register on this forum. I'm in super nerd mode right now (that state of mind that gets you tinkering, and nothing else gets done) so I haven't created an introduction yet.
Back on topic, I had an arduino duemilanove laying around that I was ultimately going to convert into an MPGuino, but upon further thought i'd like to get one of the mini's and run a remote display for ease of installation. Freeing up my main 'development' platform, i threw some LED's in a proto-board, hooked up some wires, installed some resistors and came up with a nice little bar graph that shows me how i'm doing engine load wise. As of now I don't have an actual vacuum gauge to determine exact kPa, or HGpI (however you choose to measure your vacuum) so I can't determine an actual scale. I've calibrated the code to what I think is the best 'load' on the motor for FE and when I punch it, the meter goes red, and when I'm idling or cruising at a good load it goes green. Spirited driving puts me in the yellow zone, so the apparatus does give me a good visual of engine load. I'll take videos of it tomorrow in the daylight. My hopes for this little project is to implement a big bar graph into the MPGuino code that allows you to set your desired optimal load and display it for you in some kind of pretty format.
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