First you need to order some live tuning device:
https://cobrartp.com/en/store/motronicrt/
or MOATES OSTRICH II. which sadly isnt available anymore cause MOATES ends its bussines time ago.
Then, download TUNER PRO „RT“ edition from https://www.tunerpro.net/
buy license 🙂 support tunerpro owner work!
and vuala…you can start.