I have a 190D-2.2, and I'm considering replacing the speedometer with one from a 190E.

My current speedometer goes up to 110mph (180km/h).
The potential replacement I'm looking at goes up to 240km/h (140mph). I think it's from a 190E-2.6.

If I swap the speedometer to one with a different speed range, will it still read correctly?

I did a search, and found one post that says the speedometers are dependent upon the rear axle ratio if they are to read correctly. Another post says that the gearing is within the speedometer itself and the speed reading remains correct after a swap like this. Which one is right?

The two posts are below...
http://www.peachparts.com/shopforum/showthread.php?s=&postid=500076#post500076
http://www.peachparts.com/shopforum/showthread.php?s=&postid=226336#post226336

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1989 250TD Wagon 5-speed, 160,000mi ::: Dark gray metallic / black cloth
1984 190D-2.2 5-speed, 287,000mi ::: Silver-blue metallic / black MB-tex ::: SOLD