1992 300SE W140 Speedometer Issue.....
 

I have a 92 300SE, I was having transmission issues so my buddy lent me his rack and I changed out my transmission with a Mercedes factory rebuild that I purchased from the dealership. Everything was fine after instullation, transmission shifted smooth as silk. I drove the car a time or two and didn't happen to see that the speedometer isn't working which in turn the odometer isn't working. I know both parts were working before the transmission swap. I got the car back on the lift today to make sure everything was hooked up properly and it was. How exactly does the speedometer work on this car? I checked fuses all seemed fine. I pulled the instrument cluster to make sure everything was hooked up properly. I hope something isn't wrong with the transmission, I spent the money for a factory rebuild so I would hopefully not have to worry about anything, then this happens. Other possibilities; faulty speedometer head, sensor at transmission? All help is appreciated.

Is the ABS light staying on?

As a matter of fact it is MB Doc! What does that tell you?

Blown fuse in the Base Module, located in the computer box.

MB Doc, your the man. Your diagnosis was exactly right. Thanks again!!!!!!

If my odometer doesn't work but my speedometer does and I have an ABS light on will the same fix you mentioned fix my problem??

BTW I have a 1994 SL320

For Tris135, No. You have a cluster problem.