You can but it wont do anything. There will always be pressure on the "back" one, so it will constantly read something false. And the front might have the same problem, especially if you try and squeeze it in the OEM casing.
Like DP said, what are you trying to accomplish?
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Only logic I can think of is that one is broken and instead of taking it off he rather just put one on top. The other reason is maybe he is adapting a OEM screen to use with the car pc but wants to be able to switch betweeen OEM and PC? If its anything else then I have to ask the same question, why?
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