the mdm-100 is a Multi Display Monitor. You can veiw ECU data in real time with it. Kinda like the big scan tool a tech uses, but this is small, and only reads ECU data. Do a google.com search for it, and check it out.
Actually they are around $400. I know Hahn racecraft sells them locally by me. I'm sure several of the larger companies sell them, road race engineering probably has them. Great piece, I plan on installing one with the turbo.