I have owned over 30 Mercedes vehicles over the last 30 years (mostly W123 diesel & gas). My daily driver is a 2012 ML350 (gas) that was built in Birmingham, Alabama. 4 matic. Best Mercedes I have ever owned. 80,000 + miles, full synthetic every 5,000 miles. Transmission service at 30,000 miles. The Signal Acquisition Module (SAM) is mounted behind the rear taillight. When it gets wet the gas gauge stops working. Once it dries out, no problems.