Basically, adding turbocharger to FM is easy since P-47 and P-38 are modeled just as single speed supercharged engines with high critical altitude.
There is already quite a lot useful information for proper FM in the post, but it is not enough for an accurate FM with correct gauge readings:
So, the rated power is 1200 hp at 2700 rpm up to 25000 ft. Is the manifold pressure 45 Hg. at 25000 ft and 48 Hg. at SL for the same rated power or is there some higher take-off power setting with 48 Hg.? I don't know how to make manifold pressure decrease below the critical altitude, at least in P-47 and P-38 it stays constant. If there is some higher take-off power setting, then I'd like to know its power and rpm, and if it can be used as emergency power at higher altitude. Then accurate top speed data (with loadout, fuel amount, altitude information) for both variants would be nice to calibrate the drag parameters and ram-air effect since I expect top speed is incorrect after fixing the engine model. Also climb and weight data would be useful, but maybe it is not as important as correct speed for level bombers.
I don't like collecting references and I don't have proper sources for them, but if someone helps with collecting the necessary information, then I or other FM experts can easily edit the FM to be more realistic.