If you have money, you might want to look at the Datalogging and Supervisory Control add-on module at http://sine.ni.com/apps/we/nioc.vp?cid=1010〈=US
If you want to do it yourself with AutoCAD and LabView, import your AutoCAD image in pieces so you can show valves operating, tanks filling, etc. Use picture controls and booleans customized with imported pictures. Click on this link for notes on importing pictures onto booleans.
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HFORCEKWTID=70341:5&HOID=5065000000080000005C990000&HExpertOnly=&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0
Also, look at the examples that ship with LabView 6 or 7: Control Mixer Process.vi and Tank Simulation.vi.
