If you talking about your 240D, manual there is a 10mm bolt on the driver side of your tranny which locks the spedo end in. Pull that bolt and the cable comes out. Just follow the cable down to it. The other end, of course you must pull the instrument cluster.

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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"