I have a number of new Mercedes ML Series Trip Computers A163 540 52 11
I have sold on eBay with instructions on how to install it yourself
in any ML that didn't come from the factory with one . Although they can
any defective unit that did come with one. To view a tour of the functions
of the overhead onboard computer go to this link
If you would like a 620 kb email with adobe instructions on how to install
the unit please feel free to email me at firstname.lastname@example.org
There is a remote compass module that will give the trip computer a compass
I have found the part number for the remote compass module 163 545 5732 and
purchased one to photograph.
If you have any info on the factory mounting location of the remote compass
module, I'm offering 50.00 or a free trip computer ,
to the first person to email me photos of the factory mounting location and
the wiring it plugs into.