IFflyer789 And last but not least, instrument displays are no longer anything like single signals going to single gauges, but rather a whole bunch of signals going into a chunk of software and coming out as a bunch of pixels. If some of those signals are so far outside normal flight that you are in a completely untested region, who knows what pixels that software will produce ? If there is a flaw, it could affect more than just VSI. Or put another way, that "needle" may not peg, it might wander off the VSI and corrupt some other part of the display.
but if you show the history of the datapixels on the display, mayby the least 60 sec, like in the datarecorder.... than there is a chance to trust the red line up to 2:11:45 and misstrust it later....
