EDIT: Totally missed the part where you said Scangauge 3... all the below pertains to Scangauge 2. I didn't even know they had a newer version. So the following may or may not be helpful in your case.
TPMS works great on my '09 (but unfortunately not my '06, it's too old) with a 4.5+ firmware Scangauge. It should work on your '15 if your firmware is 4.5+.
www.thenewx.org
One thing that's not ideal, but not a big deal, is that you have to remember which tire is which, as it'll just display them as TP1, TP2, TP3, TP4, and that does not correlate to the tire position. To figure out which was which, I just set tires at 25, 30, 35 and 40 PSI and drove for a bit. On my X for example it's
1 3
4 2
Next time I do a front to back tire rotation it'll be
4 2
1 3
I don't monitor all four at once, just typically have the TP(x) on the display along with volts, AT temp, and MPG. If I want to check all four tires I just toggle through the four TP's.
TPMS works great on my '09 (but unfortunately not my '06, it's too old) with a 4.5+ firmware Scangauge. It should work on your '15 if your firmware is 4.5+.

TPMS Sensors Recommendations ?
Hello everyone ! I have a question... what TPMS sensors would you guys recommend to get to replace a dead or non existing ones at all ? ) Dose it matter if they from amazon or lets say from rockauto ? what would you guys recommend on getting ? Thank you )))
One thing that's not ideal, but not a big deal, is that you have to remember which tire is which, as it'll just display them as TP1, TP2, TP3, TP4, and that does not correlate to the tire position. To figure out which was which, I just set tires at 25, 30, 35 and 40 PSI and drove for a bit. On my X for example it's
1 3
4 2
Next time I do a front to back tire rotation it'll be
4 2
1 3
I don't monitor all four at once, just typically have the TP(x) on the display along with volts, AT temp, and MPG. If I want to check all four tires I just toggle through the four TP's.