I was just thinking about that on my drive home from work today. How interchangable are the speedos from those cars to a w123? If they don't interchange, I wonder if some of the internal gears could be swapped to fix the ratio.

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My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much)

Wife's - '08 Saab Sportcombi Aero

Riding a '03 Yamaha Warrior