My apologies for previous sarcastic reply, it was just toooo tempting!! but as you probably guessed it was said mostly tongue in cheek, and not being critical to the author! To get back to the crux of the question, I suspect you can't find the real-time TQ with the malfunction you've spoken of (except of course trying the obvious, cycling between the other 2 screens). I've seen the old IIDS system play up like this, but not since Sikorsky changed IIDS manufacturers (who is it now, Parker-Gull or Rogerson-Kratos??). Does an IIDS equipped C+ have the DDR? I don't think so, suspect they got rid of it and imported the DDR display functions into the IIDS. I think this aspect is really what you were getting at, as the DDR would show all engine parameters independent of guage malfunctions and the C+ with IIDS doesn't have the DDR?? But all this sounds like an excellent question for Nick Lappos, or just about everyone else because I ain't real smart in the first place!
BTW, not many C+'s in this part of the world, it's too hot!