Finished installing the Prado 120 field monitor (and new side trim). Was really not a terribly complicated install. I could do it again in prob under 2 hours, even less with something better than a razor blade to cut the dash.
The only real issue with these in a GX470 (besides cutting the dash) is that they are [currently] stuck in Celsius temperature, and if you have a ML sound system with middle dash speaker, the field monitor cannot fit with the stock speaker and it must either be removed or replaced with something smaller/thinner.
I am still messing with mine to see if I can get it to switch to F degrees, but I also wonder if not, if there is a version that is available from another area where they would use F degrees and had the Prado 120 available with the field monitor. Seems there is really only a few countries that *might* fit this description....
Some stuff I have already gotten to switch from kms to miles and m to ft. I'll keep messing though and post up more details.
View this thread, starting on Post #35 for more detail on my Field Monitor swap:
Prado 120 Gauge Cluster Swap Into GX?
A better shot of the Field Monitor display: