So you've deduced that BMW has forced you
into a position of being in one of two categories without a temp gauge. You can be a dumb owner without any feedback from your car, or you must elevate all the way up to expensive code readers that are capable of giving you temperature and pressure readouts after you master the software.
How do you like no dipstick so you can't see your oil level precisely, and how do you like runflats without a space for a spare?