I started running 195/75/14s and that took care of most of my speedo error in both my 85 TD and 85 240D, at 70, 75 they still read a couple mphs fast, which is close enough for me.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"