FMichaud,
There are tons of people on here who have performed exactly what you're asking. I would bet that the A-pillar for the 04 trucks is identical to those for the 03 trucks, so yours should install no problem, per the instructions that come with it. Note that in the instructions they tell you to hacksaw off the handle and install the propod over top of the existing A-pillar piece. This is to comply with NHTSA regulations. All I will say is, it's not the only way to install it.
As for installing a transmission temp gauge, do you have an auto or manual? For manual, I recommend getting yourself a set of Fastcoolers from Genos. They have a 1/8 NPT port on them. For automatic, I believe you'll need to install a fitting in the transmission pan, which isn't difficult at all.
For turbo boost, look at
this.
For an EGT thermocouple, where do you want to install it: pre or post turbo? Most people install them pre-turbo, but it depends on your intended use for the gauge. If you install it pre-turbo, you'll need to drill the exhaust manifold. Here are some good threads about EGT gauges:
Pre or Post?
Where to drill
Where to install with pictures
Pyro install a success
Installing a Westach probe - where?
All of the above information was located using the search feature. I know this place can be extremely overwhelming at first, but you should try searching on what you want to do, because if you want to do it, it's almost guaranteed someone in here has already done it and posted about it.
Welcome aboard.
