The drive shaft is an easy place to get that info from if add a magnet & pick-up.

The traction system is complex & if you decide to TAP into that info, I would suggest adding a diode so that there wouldn't be any feedback from your rally computer into the traction system computer.

__________________
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)
Retired Moderator