There is also an oil gauge tube that needs to be disconnected, and some lights that you twist and pull out and a multi-pronged round plug on the left side.
When I screwed the speedometer cable in as tight as I could by hand, the odometer didn't work. I used a water pump adjustable wrench on it and an open end wrench on the oil pressure gauge.
Don't forget to reconect everything, especialy the oil pressure gauge, which is armed (with oil) and dangerous (to your mat or carpet).
Semibodacious Transmogrifications a Specialty
1990 300D 2.5 Turbo sedan 171K (Rudolf)
1985 300D Turbo TD Wagon 219K (Remuda)
"Time flies like and arrow, yet fruit flies like a banana"