I always wanted to see more data about my car in cabine. With OBD2 adapter that is possible and cheap.
All you need is bluetooth adapter, android phone ( it works on some others with different apps), and i used app torque pro.
http://76.my/Malaysia/ultra-mini-elm-1-5v-elm327-bluetooth-obd2-diagnostic-nicholaslai-1208-15-nicholaslai@10.jpg
I used old Wp 6.5 phone. So i had to hack it and installed android. Then installed app Torque pro.
https://play.google.com/store/apps/details?id=org.prowl.torque
Paired BT elm 327 adapter with phone and set up profile for my car. Then you can change settings in app, like sleep when phone is without power… You can also choose different themes and create own dashes.
Another usefull app si No lock. This app prevents phone from locking.
https://play.google.com/store/apps/details?id=org.jraf.android.nolock