Good to see a fellow Jeep owner here! We have similar tastes in automobiles as I also have an MB. You should check out my post on Rebuilding the Jeep in the general section.
The speedo issue you are concerned with is a common problem. The impulse generator goes bad. Dennis McCann has one for $65 and it is an easy install (you have to remove the right rear tire to get to it). I think the part number is 116987. Check him out:
http://www.allferrariparts.com/home.html
The speedo issue you are concerned with is a common problem. The impulse generator goes bad. Dennis McCann has one for $65 and it is an easy install (you have to remove the right rear tire to get to it). I think the part number is 116987. Check him out:
http://www.allferrariparts.com/home.html