Hi!

You can add as many gauges as you want (and organise them how you want) on the screen, so you should be able to have way more than just 1 on the screen (check google for screenshots to show how many).

This is the same for the lite version as it is for the pro version, so you should be able to add more than 1 display

The full version of Torque (Pro) is on Google Play

What's the advantage of Torque Pro over Torque Lite?

Per the Torque app web page:

The paid version has support for more vehicles and ECU types, looks a lot nicer, and works with more cars / trucks. The paid version has more features (HorsePower,Torque, 0-60 , quarter mile tests, graph data, map / track views) + no adverts and exra dial/display types! and better ABS / Knock sensor support, Transmission temperature support for some makes of car / trucks (GM / Ford, etc), and Turbo Boost on many more vehicles (including VW)

Regardless, this app provides a lot of capability that likely took a lot of time to develop (and scan tools with similar capabilities cost 10x to 100x more). The developer is responsive to users and keeps adding useful new features, so in my opinion, the price for the full app is well worth it (and then some).