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I am not for sure what the last update did for the 2004 model year trucks, but on my 2006 I have trans temp, boost, and countless others. It looks like egt will have to be an add on sensor. I haven't heard about fuel psi yet. Go to the dashhawk web site and to there forum. You should get more answers there.
I believe that Riggz now has a beta file he is testing that has the trans temp working on his 04. I think they plan on releasing a new version to the public next week (although the beta version is posted in their forums so anybody who wants it can download it).
I have an old beta file that works but crashes occasionally. The current public beta release allows everything to work correctly, but the unit won't shut down now when you turn the truck off. This is just a minor issue and I'm sure they will have it worked out soon. If you are wanting one, I would suggest to wait until they get something solid released for the 2004 6.0Ls. Or you can try it out and I can send you the beta file that works best for me. If money is not an issue for you, skip the DashHawk and look into the DashDAQ from DrewTech. It looks pretty promising.
On my 2004 I can monitor the Boost, Trans Temp, Engine Oil Temp, Coolant Temp, Intake Air Temp, and quite a few more. I also have a beta EGT probe that allows me to monitor the EGT. I believe they should have a public version for sale soon.