OK thanks, that help me alot.  You are close to the actual size gauge at 80% zoom.  A real 787 would measure 30.5 cm wide - which is basically what you have (not sure if real 787 is measured on inside screen or outside.).  So it seems a 55"
 screen is needed for full size gauges at 80% zoom.

So you are 38% larger than mine gauge which measures ~22 cm.  and that make sense at I have a 40" screen you have a 55" screen.  so yours is 38% larger.

One last question.  With a top notch video card (like the Titan X) I have) the 55" UHDTV should be crystal clear??

 

Yes, my Samsung UHD 55 s 7 is crystal clear. Much better than the 2 images shown in the post above.