ASI Cockpit Gauge not matching Speed of External ASI or FIP
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I actually see it to be ~4kts too high in the IAS gauge (compared to what is indicated via SimConnect), but it's definitely not showing the correct IAS. Maybe the deviation isn't linear which would explain your 8kts difference and my 4kts difference.
Also the IAS gauge's TAS/press.altitude scale is wrong by ~4000ft for me, which I already reported to support.See also this thread where we also talked about this and other issues with IAS/TAS/GS indicatons in the PA-28R:
https://community.justflight.com/topic/1774/tas-gs-weirdness