I don't know of any after market DEF gauges, but it seems strange that Sprinters are so inconstant, as far as some having the DEF gauge and some not. Mine is actually a 2016 chassis, though its a 2017 RV, and the dealer seemed almost surprised that it had the DEF gauge. I also added a scan gauge, since there is virtually no engine or transmission telemetry displayed on the dash, only Oh God lights. Its nice to have all the engine and transmission temp telemetry, as well as all the other stuff the scan gauge has, including gallons of fuel in the tank, to the 10th of a gallon.
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