I use Scanguage II for $159 or Google it for lower from Rv place I bought last from.
It's the best guage thing I've ever seen.
I put it on my 2007 6speed auto RX8 many years ago, and found a code from a guy with Mazda 6 that gives me trans temp.
I had some kind of problem with trans at 23k miles, and Mazda gave me a new one.
I put a 18,800BTU tube and fin cooler and lowered temps 14 deg f measuired at inlet and outlet.
Now I can cruise high spped on hot day with engine coolant 193f and trans 193f.
Scanguage on my BMW X1 s28i doesn't work to scan codes since BMW is tricky, but gives turbo boost and hp.
I use as Corrected speedo, reaL WATER TEMPS, ATT TEMPS, AND VARIOUS current or tank mpg.