I think you could edit the panel.cfg and add the gauges needed to a popup window. This could then be dragged to a second screen. I haven't tried, it's just a mind made concept. The 727 is VC only, so you currently can't grab certain gauges.

On the AP. Please search this forum section. Lou, the former rw Captain wrote a ton of useful stuff about it. Be aware that the thing is basic and limited in its features. So the comfortable climb to a commanded altitude is a thing of the future for us 727 drivers.  :D
Pitch her up, control and monitor the VS and level off timely when you've reached the desired altitude. That's all there is and Lou didn't have much more back then.

From the concept, you may be able to cheat when adding an AP gauge from a default plane. But, hey, that's not it, right?  :)