Ok, IIRC, the FTIT 'zero' position in the sh. mem is something like 700. Now, if you want to mimic falcons FTIT gauge, you have to set the needle to NOT move until the FTIT is something like 784 (or something like that off the top of my head). The way I did that was to set the min to 700 and max to 784 for the FIRST scale of the FTIT and then have the needle move ONE tic only of the 256 possible. This way, the needle moves one tic between those values but that one tic is so imperceptible you'll not notice it and you will think you have kept the needle stationary. Now, you'll get a bit of a different rate of change, i.e., the needle will move faster than what you see on screen, but that's just the way it is. You'll start to move at the same time and you'll end up at the same number you see on screen. It works, I've done it and can mimic falcon almost perfectly.
What you have to do it run OF in "windowed" mode and pause the sim just as you see the needle move for what ever gauge you are calibrating. Go into F4IM and pull up the sh. mem window with all the values and not what the value is when you paused the sim. Repeat this a couple times to verify your result. Do the same for when the needle comes to the resting position and then pause the sim, go back to F4IM and look at the sh. mem value. Note both of these and then use them for the max and min numbers on the next scale.
Yes, it's PITA, blame the original coders of falcon. BUT, you only have to do it once. SAVE the file, don't loose it. My file got zapped while beta testing for Leo. I went through quite a few hours of testing these gauges to find all these little bugaboos and figure out what was falcon and what was F4IM. Believe me, it's NOT F4IM.
Oh, FYI, the FTIT temp only goes to like 825 max in the game. At idle, you should be 575.