Many times when the BATTERY is disconnected OR jumped the protection fuse for the ABS computer will BLOW! That will keep the speedo from working & the ABS/ASR lights will stay ON.
This fuse is in a computer under the hood on the passenger side. The cover for this box must be removed & then check these fuses.
The box looks like it has a "OIL" cap but IT isn't!! Good luck.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)