Paul I am using this in FSX on a Dell Pentium i7 3.4ghz 8 gigs ram, 1024 mb video card with plenty of HD space.  The gauge opens I can change the v speeds, reset the fuel burned, but the sound check does not work.  I checked all my setting with what you have and what the read me file had and all is there in the same order checked and double checked.  I'm stumped.