nice to have also this kind of software for windows phones! seems to be stable and so on. very easy but no adjustments.
with lumia 920 there's scales on both end, as the backround is basically a picture, also very non-adjustable, for example RPM to 10000, and diesel does only about 4000RPM... anyway, this info is also on dashboard. but perhaps variations diesel/bensin? and fuel consumption scale upto 50 l/100km with car that does less than 5 as average... some instuctions for calibration, gives wrong (but visual) results.
anyway, one major info is missing, catalysator temperature. that tells that burning of particle filter is ongoing or not. for the same screen also coolant temperature would be needed, as burning starts only after engine is hot =above 70C (no temp gauge on car). to get burning done properly, higher than normal RPM:s = one gear up and perhaps a little extra driving...
for diesels also engine timing advance... well, non-existent. however, recirculation of exhaust gases might be interesting. one can see if car is trying to heat motor or not (outdoor/indoor/engine temperature dependent) and this affects how fast car is slowing down with gear on. as does the charging voltage...
also voltage levels, as there's"smart charger" so mostly charges battery when slowing down with gear on. and at stop, how does it go with time when engine is not running. at winter car tries to keep battery full...