Obd2 Cable for FCA 12 8 Gateway... https://www.amazon.ca/dp/B0C1YGJ96S?ref=ppx_pop_mob_ap_share You need to get this tool and connect it under the steering wheel not in obd port https://youtu.be/FYj-nMOnrfQ?si=3Fqk7xrAMmRevjyy See this video for reference you’ll get SRT logo and Srt font in speedome...

I tried to get Srt Performance Pages in 2018 chrysler 300s.
But it shows warning that it has invalid ISO. And nothing works for the car. Any help?

You need go into settings of multiecuscan, then interface, then click scan interface.
that solved my problem but still im not able to get srt performance pages as it says invalid iso?? don"t know much about that.