Hi,
I need a W123 speedometer for a 3.46:1 differential setup. I believe some years of the 300D had this differential. Does anyone know the years & speedometer part #'s? Is there a code identified on the speedo's that tells you what ratio differential it mates with?
Also some models/years of W123 used a electronic speedometer. Anyone know the year/model & part #?

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83 280TE- 5 spd, 16.5mm rear sway
85 280SL- 15" Bundts, 5 spd