Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
Please see this thread for updates. Update Thread
SOH ADMINISTRATION
.would this post help you? https://www.avsim.com/forums/topic/260893-program-to-edit-gau-files/
Well, in this day and time...so Long as it was released as freeware
and all credits are given, along with the original readme file, why would
anyone have a problem with it ??

...hope it is right.
Not sure but I think that the P51 might be a stock gauge. But this is for the other two;
PR_SpitVII.gau : Mike "Moparmike" Wagner - hawker.gau : Philippe Burnage
from CFS2 Spitfire VIII "Betty Jane"
Found it here: http://www.flight-simulator-world.org/download/cfs2-spitfire-viii-betty-jane/
....I looked and I have a P51_clock.gau that is dated 5/30/1999 and it is from a AS P-51 Mark 1A by Dickens here is the attached file I have
j<P-51.View attachment 62695
Tends to make my walking conscience a bit peeved when I do. Besides I don't like to partake alone. I find the conversation boring!