Sorry but my celcius gauge is long gone. It was acting up before I replaced it. Soldering didn't do the trick so I just threw it away. You can find several on eBay, and actually I'm not sure if the W126 gauge would fit on a W124. You'd have to check on that first.

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1999 Mercedes-Benz S600, 103K miles - garage queen
1988 Mercedes-Benz 560SEL, 89K miles - daily driver
2007 Hyundai Sonata Limited, 31K - daily driver