Just showing off CarBridge functioning on my Focus RS
Jailbreak a supported iOS device (I am using my unused iPhone 6S Plus on iOS 12.0)
Chart of supported devices: https://www.reddit.com/r/jailbreak/wi...

I followed EverythingApplePro's iOS 12.012.1.2 jailbreak video:    • iOS 12 Jailbreak Released! How To Jai...  
Downloaded Cydia Impactor: http://www.cydiaimpactor.com/
Downloaded unc0ver v3.0.1 Release ipa: https://github.com/pwn20wndstuff/Unde...
Purchase CarBridge in Cydia (support given by leftyfl1p discord's page): https://discordapp.com/channels/30445...

For obtaining the OBD readings:
Purchase OBDLink MX+: https://www.amazon.com/gp/product/B07...
Download the OBDLink App on the Apple app store: https://itunes.apple.com/us/app/obdli...

That's really it. NOTHING is changed on the car. CarBridge works on ANY Apple CarPlay supported vehicle. The OBDLink MX+ works on ANY OBD2 vehicle. So I am able to take this setup into my wife's Honda Civic for roadtrips.

Total Cost: $85
OBDLink MX+ $80
CarBridge $5

Let me know in the comments or the DMs if you want me to try something with CarBridge before you dive in!