k...here's how to do it:
in the cell you want the info displayed, you have to type =[sheet1!]$A$1
replace "sheet1" with the tab you are drawing your info from, make sure to include the !, also don't use the [ ], and replace A1 with the cell number its coming from on the first sheet.
so for example I want to draw the info from cell C7 from the "Assumptions" tab, it'll look like this:
=Assumptions!$C$7