hi oldtrucker:
did you eventually succeed with this? I'm interested to DIY one for myself too

Hello,
buy VAG USB KKL 409.1 (cost 9$)

Sale VAG com USB KKL 409 1 OBD2 OBD Audi VW Seat Skoda | eBay



and connect 3 wiring to KKL


connect wiring to diagnostic socket mercedes W124
1-black wire
8-yellow wire
16-red wire



and use this for diagnose the car

No need to use the old version of the program.
The latest version is always available on my web site
Successes in the diagnosis of the old Mercedes.

.

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Mercedes W124 diagnostic scanner (code reader and live data) with laptop