Very few places seem to sell these type of inductive DC ammeters. SnapOn does carry a set of 2 for $65

http://buy1.snapon.com/catalog/item.asp?search=true&item_ID=11307&PartNo=MT1009&group_id=1477&supersede=&store=snapon-store&tool=all

After some searching, I found this company Hoytmeter.com that still make them.

http://www.hoytmeter.com/products/products.php?catid=53&subcat1id=67

Model 663 75/0/75 Amps $24.38 seems to be the best choice for the Mercedes. You can also use it on any wire with DC current flowing through it, such as alternator, headlights etc.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked