FS2004 - The installation of a digital Speed Gauge with True speed and Indicated speed readings. The instrument can be installed as a new gauge, or in a new window, which can be opened by a small button, then the gauge can be resized and positioned to any convenient panel location.
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True airspeed (KTAS) is the speed of your aircraft relative to the air it's flying through or the ground. As you climb, the indicated airspeed (KIAS) is decreasing. The reason is that, with the altitude gain the pressure decreases , so for any given true airspeed, as you climb, fewer and fewer air molecules will enter the pitot tube (which measures the speed) therefore the Indicated air speed will gradually be lower than the true speed. See the standard conversion below.
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Standard conversion with altidude gain:
Sea level, 15º C, 120 KIAS, 120 KTAS
5,000 feet, 5º C, 120 KIAS, 130 KTAS
10,000 feet, -5º C, 120 KIAS, 140 KTAS
15,000 feet, -15º C, 120 KIAS, 151 KTAS
20,000 feet, -25º C, 120 KIAS, 164 KTAS
25,000 feet, -35º C, 120 KIAS, 178 KTAS
In FS 2004, you have a choice in Realism Settings to select:
Display True air speed (KTAS) or
display Indicated air speed (KIAS).
While the standard ASIs used in FS comply with these settings, my instrumet shows both, regardless which setting you use.
If your aircraft has autothrottle and if it is engaged, it will hold your selected speed as per your FS Realism setting. (Your aircraft will hold the True speed if Display the true speed is checked, alternatively your aircraft will hold the Indicated speed if the Indicated air speed is checked.)