So far tuner pro has worked for everything I needed except setting up the fuel gauge. I swapped a LQ4 6.0l into a 99 suburban and trying to get the fuel gauge to work. I know that it runs through the computer but so far I cant use tuner pro to change the tank size or set up a output for the gauge. Is tuner pro incapable of doing this or does a depend on a certain XDF file? Thanks.