This information was provided by JimF on Mercedesshop. I'm sure he wouldn't mind me giving out his link. I have built one of these and they are very useful. They will not pull up detailed codes however, just the basic ones.
01 ML55 AMG
92 500E (a few mods)
87 300E (lots of mods)
00 Chevy 3500HD Diesel Box Truck
68 18' Donzi Marine
06 GT i-Drive7 1.0 Mountain Bike (with GPS!
PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320