I have a BW 65 automatic in my Bavaria and have had leakage around the speedometer cable. I changed the main o-ring (#19) and still had a leak. I realized it was the 0-ring/spring (part 20 below) that was the issue. I need the part number or the whole unit (24211205066) if anyone has one. Can I assume I can plug the speedo port to the tranny so I can drive while searching for this, knowing I have no speedometer?