setting up tablet for touring

Hi all
looking for help setting up an android tablet for my truck. requirements/apps are:
1. 9 or 10" screen
2. Phone – connect via Bluetooth to apple and android devices, answer and make calls via tablet and access to contacts
3. Music – storage and play music use headphone jack out to aux in on existing radio
4. Nav – both on highway and off road. Off road would be by using the Hema app and maps and on highway will be google maps.
5. tyre pressure monitoring by http://www.digoptions.com.au/tpms-tire-pressure-monitor-system-6-internal-valve
I have a tab S 8" that I'm using for testing and have purchased the Dashdroid app but have already run into problems as my 5C phone is paired but can not connect (says the Tab S is not supported???)
I don't want to purchase a new head unit as I wont get the screen size and I want to keep the original radio for AM/FM access in country areas.
Thanks in advance
Bob