I got fed up with this issue....no oil/coolant temp on track without all that secret code crap once I stop. Or I could block my vents for $500-$1000, which seemed like overkill for my limited needs. So, I looked at apps and came across FourStroke for free plus the $3.99 upgrade! Installed the app in a minute, plugged in an OBD2 reader ($20 Amazon same day) and bam :
Sorry for the bad pic...this is my iPad screen shot....had to rotate and crop to download