My car did not have any connection on pin 24 on the car loom side of the x20 connector. When I added the MPG gauge dash I had to add an extra connection to pin 24. This was connected to connector x16 pin 21 in the back of the dash. (
see here)
I wrote up a comparison on the x20. See here >
http://www.318ti.org/forum/showpost....1&postcount=27 Its a zipped excel file. Other