The Nikon D3200, among others, uses the existing aperture setting for Live View. It will, in other words, start with whatever your aperture setting is when you shift to LV, even though you can adjust it once you're in. The adjustments will not show in Live View, which uses its own exposure meter for viewing only, and begins at the aperture if first sees.
So always make sure the aperture ring is set to 3.5 before you switch into Live View, and you will have a visible display.
I presume you know that this lens does not meter at all on the D3200, so once in LV you must be in manual mode, using the aperture ring for aperture, the camera wheel for shutter speed, and guessing the exposure, which you can check afterwards with the histogram.
I see Bjorn beat me to this. I will mention, though, that the D3200 does not offer a "T" setting. Instead, the ML-L3 remote makes the "B" setting operate as "T." With the remote, the first push of the button opens the shutter, and the second closes it, and on the D3200 this is the only way to achieve a true time exposure. The remote is very inexpensive and very handy anyway.