Thanks guys. I've read about the probable causes and the speedo cable / drill trick from the searches I've done. I can't get the light to reset yet to see if it will come back on. The CE lightcame on during a morning start up when it was -4F in SE CT so I am a little suspicious of the EGR failure. I wonder if it was temp related.

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles