99 ml430 trying to a little research before I dive in. I believe doing this is pretty srtaight forward except for the VSS wire(vehicale speed sense)Another web site said I would need the following parts to convert the signal to something useable (http://www.delta-autotronics.com/Speedsensors.htm
Mercedes Benz M-Class 1998 1999 The M-Class has a CAN-bus. An adaptor is needed. The following parts are required: 1. No.B6 782 25 19, CAN-Adaptor. 2. No.B6 782 25 96, CAN-Adaptor cable. 3. No.B6 782 25 94, Vehicle adaptor cable. White and green. The adaptor has to be connected to the 2 cables of the data bus. They are marked with N78. The cable colours are white and green. These cables are located between the driver's and passenger's seats.

Is this correct or is there a better way to achieve the same results?

 

apparently using the Alpine speed sensor is the easiest way to achieve this. I will post picture once complete