Hi Soar,
When I took delivery of my GA-890FXA-UD5 I asked Gigabyte what the TMPIN readings were. For my motherboard they are as stated and I see no reason why they wouldn't be the same for your motherboard.
In some instances the TMPIN2 readings will show some extremes that just can't be true such as -60C or +150C or variations thereof. This is because the motherboard doesn't have a Northbridge sensor and this is what Fadsarmy is possibly referring to.