USED oem VDO fuel sending unit removed from a  either a 1995 SL500 or 1992 300SL .  Tested for continuity and variable resistance.   Ready to install.  Limited installation instructions provided.  This sending unit system will only work correctly if the rest of your electrical wiring and guage are functioning properly.  Diagnose your problem before throwing parts at the problem.  Sold by part number only.  Ensure your application will accept this part number:  129 542 00 04.  THIS LISTING IS FOR ONE SENDER ONLY EVEN THOUGH TWO OR MORE MAY BE SEEN IN SOME OF THE PHOTOS.  The part will be shipped to you via USPS priority mail to the lower 48 states.  Others contact me for shipping costs to other locations.. Thank you for your interest.    .