Donnie is absolutely correct about your scanner needs. The difference is like morse code versus the telephone.
All cars designed after 1994 (the 124 body doesn't fall in this catagory) require a serial data scanner. The car has too much to say to do it by morse code!! A few systems can be impulse counted after 94 to about 96, but not SRS.
I would really love to show you the difference. Which brings up an idea I will explore on a new post.
Bosch Master, ASE Master, L1
33 years MB technician