Hi Lipra,
you can get the helicopter trim gauge here:
http://library.avsim.net/search.php?SearchTerm=helitrim.zip&CatID=root&Cookie=1or Login the AVSIM library and search for helicopter trim gauge.
It doesn`t work like e real world helo force trim, but for fsx it works quite well.
I forced it`s fsx slaved Buttons to one of my Saitek X52 coolie hat`s. So I can control trim via Joystick.
The Panel helps reading out your actual trimm Settings.
If you own fsuipc payware Version, there`s also a heli trim System implemented. You can read fsuipc Manual to learn using it. But this trim System has no gauge Panel. That is the reason I don`t use this one.
Dirk Fassbender`s Autopilot is something completly different. As it`s name suggests, it`s an autopilotsystem with a wide range of functions e.g. auto-hover. It works like a dream and is very well known by fsx helisimmers. I also use it on some helos in fsx, but not with the Nemeth AS350 which I took the screenies above.