So I have just finished a long 6 month project (I travel a lot and don't have much time for projects) of converting my 93 300d 2.5 turbo from an automatic to a 6 speed! She is legal, on the road, and driving beautifully! The last piece of the puzzle, and one small problem is I have no idea how fast I'm driving...

Here is what I have:
Electronic speedo from a w124 E420
Dakota Digital SGI-5
Intellitronix S9020 gps speed sender

The pinout for the 3 wire connector on the speedo is as follows:
brown - ground/sender ground
white - sender signal
black/red - power

The problem is (and where I need your help,) I don't have the 3 pin connector/harness... So can anyone help me with what is what for the three pins on the attached picture?


Also does anyone know what the oem speedo PPM is?

Thanks for your help!