wire diagram
 

Still no luck with my 93 w250 I have checked the speed sensor at rear of trans that shows resistance with ohm meter. Checked fuse panel speed motior fuse is good, Even swaped out the speedometer cluster. With no luck Comes off that fuse with a white wire and red tracer( any one know where that goes??? Because i have no power and the speed sensor(which is a white wire with an orange tracer.. So a wire dagram would help a ton, May be something 1993 diesel only. Any input would be great.