Not digital but the drive comes from an electric motor in the spedo, similar to the W126 chassis.
The only reason for SPEEDO cables in any W124 chassis is the fact in Germany that that was the primary car for "taxi-cabs" & they needed yo use cables as electronic meters weren't ready for operation as they are now.
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)