When the speedo is reassembled, how do you ensure getting the right spring tension on the needle?

If I recall correctly, the clockspring puts some tension on the needle, holding against the stop post.

I've popped the needle over the post, ccw, and noted where it rests, then reassembled with the needle in that location. Then popped it, cw, back over the stop post.

Jim

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