I'm by no means a labview expert, but here is how I got this to work last year.
In one case, I created a simple numeric display of the first variable. Then, in the second case, I created a local variable (Programming -> Structures> Local Variable) that referenced the numberic display in the other case. I've attached a picture of what I did.
I also used the concepts from this example VI for displaying multiple items on a graph:
http://www.chiefdelphi.com/forums/sh...ad.php?t=45210
I hope this helps.