Paul -
The MB WIS has much better wiring diagrams. You can buy copies of it off of Ebay very cheap. You just have to pray to the PC gods before you install it and hope that it installs without a hitch. It also requires 5 GB of disk space but you then get to browse info on about every MB car, truck, van, bus, Unimog, etc., built since 1968
The wiring diagram function is not just one graphic, or I would have tried to email it to you. It is an interactive tree/thread thing which will jump you all around many diffferent pages. If you are looking for something simple, I will attempt to look it up for you but if you are needing all of the wires for the ECU I doubt I can find, much less print, that in one diagram. PM me with specifics.