Hello together, I play with the idea of retrofitting my Seat Mii BJ 2015 GRA and MFA. For this purpose I would like to estimate about the effort and the costs. If MFA is too expensive, I can do without it, GRA is more important to me. I would probably have to replace the power supply control unit, on the factory side is the “smallest” variant installed, which lacks the inputs for the switches/buttons on the steering stick levers. Is there something special to consider here? Or can I use any used control unit, with the matching part number (1S0 937 087??), pull out of the bay and simply install it? Does something have to be learned? And away from the tacho… Currently, I have to have the motor control unit and Tacho (wg. roadblock) which consists mainly of 7-segment digits – see photo. Can this tacho then also represent an MFA? Or do I also have to be replaced with the tacho then I would probably have to have to have the engine control unit and tacho (wg. roadblock) be taught to each other, but it is not necessary for me?