The speedo head is mechanical, so if the odometer is working, your cable is functioning. When you have a tight cable, it is wise to disengage it from the transmission before pulling the IP and damaging the cable/speedo head.

Question:

You say the odometer works. Is it accurate or recording less than the true miles driven?

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles