No "onscreen adjustable demonstration" in the threads, but there are onscreen images in those other two threads that I provided the links for on post #160.
edit:- adding them here:
I9kfangui Version 2.2.2 is here! and
Beta Testers Wanted - I9kfangui
Also, you will find a link to the developer's (spudsdude) Home Page and I think that may contain some of what you are looking for:
Welcome to M.D.I. {LINK HERE}
This has been a VERY WORTHWHILE improvement to the basic i8 FanGUI for my D800 as well, control of GPU Fan by GPU Temperature
was an excellent idea and there have been absolutely no problems with this utility.
I still use the V2.2.1.03b version as I found that I could just create a 'Profile' to speed those Fans up to High Speed at will and that
seemed to be the change added for the more recent revisions.
You should also visit:
Dell Inspiron 8x00 fan control utility {Link to the creator's website}
and also read the "Manual" and FAQ's on that site

SPUDSDUDE has promised to release a "Stand-Alone" installation, but for all the previous versions, you had to first install
the basic program from the above site. This is all explained in the 'threads' and you should read through them

It would be very important for you to know, for example, that your XPS2 uses Both Fans for extra cooling of its GPU..
(Most other systems use Fan #1 for CPU and Fan #2 for GPU and i6000's, 600m and 700m have only one fan.)