Depends on what you mean with power and pressure?

You can read you live data on 'pressure'  in intake manifold (if MAP), boost pressure, etc. If datapids are there it can be read most of the time.

Don't know what else you want to read. If you want to calculate horsepower you'll better buy a good scope and needed measurement equipment plus take a scope training. With that you can indeed 'measure' the power of the engine.

 Maxisys is a diagnostic tool. You need a dyno to test power output of a engine. There is no tool to determine the life of a engine that would be the purview of crystal balls and palm readers

 Engine life depends on a number of things and is not a solid number. Wear and tear can be going on for compression (even that has several reasons), rods, valves, etc etc. You cannot pin a certain solid number on such a thing as 'life percentage' for an engine. Not by a scantool at least, you will have to measure a number of things and put the info into perspective of original numbers. If you do not have a really urgent need for this, don't do it, really it won't bring you much value.

Most important for a lot of engines is compression status and that you can measure with dedicated tools.

  The Maxi's software for Ford  should offer a power balance test,but not relative compression ,or relative fuel injector flow yet as far as I am aware of.

  Michael i wouldn't rely on maxisys to read a VIN at this time and as for you question a definite no. a dyno is the only method to measure power accurately...