I fully understand the wish to use a tyre pressure monitoring system (I have one myself, but it is integrated in motorcycle instrument cluster).
But why integrate it in an navigation app? I think, using a further specific app which gives the possibility to show the tire pressure/temperature as overlay and give an alert in case of pressure decrease would be a good solution (but neither I have any own experience with that nor can I recommend any app 
).
On the other hand there are some arguments against further apps, as already discussed in
Please do not misunderstand - in general I would appreciate each additional feature, so also tire pressure display in Kurviger app. But the developer resources are limited, and usually the question is “which feature should be implemented, which feature should be postponed or discarded” - and so I think, functionalities already covered by other apps should have a lower priority.