Thanks for the help once again. I'll invest in a different air filter as soon as possible. The 5 inch exhaust is mostly for sound for me, i just like the way it sounds. The fuel plate seems like a good idea and the timing also. I'm willing to try anything that will help with mileage that wont have me digging too deep into my pockets.
My opinions are based on 30 years of being in and around the pipeline business and they are only opinions.
First I have to guess that this is your first truck. Most in the business have worn out their 12 valves long ago.
No problem though it is a great truck, and will serve you well as long as you keep up with the maintenance and keep on bolting new parts on it.
Best advice I can give is set it back to stock with some added timing get new Bosch 215 injectors or have yours rebuilt and tune the smoke out of it, either pull your fuel plate completely or grind a nice profile. But back off of the smoke, it is tuned properly when there is very little smoke.
Keep the turbo stock and run the shortest 4" straight pipe that you can, you will soon get tired of the drone and then you can put something else on it.
Stock air box because in some of the locations that you will be working a stock filter is all that you will be able to get and you will need to change it often if you are on the right of way all day.
Same applies for keeping all of the other parts stock, availability in remote locations.
You do need gauges as they will assist you in getting mileage and help you to not hurt your truck. For mileage keep boost below 10 and temp below 1000 even when towing.
You did not say if you are keeping the pickup bed or using a welding bed, (aluminum is your friend) what machine are you going to run? They all have their issues; sa200 light, best arc, gasoline, old ;sa250 good arc,diesel, heavy, noisy, vibration; pipe pro ok arc, light, diesel; sae350 great arc, might be diesel, heavy enough to sink a battleship.
Keep as much weight off the truck as possible do not let heavy stuff accumulate 2 oxygen and 1 acetylene is enough. You will be heavy enough with all of the stuff you have to have.
Upgrade your transmission as soon as possible as you will be towing your house at some point in the future, that is just the way it is.
Run the best oil that you can and change it often especially on your machine rule of thumb every 100hrs on 200 and 250 I think the pipe pro is like 150 or so, your machine is your life take care of it same goes for truck.
I personally hate working out of a truck with anything over 33" tires but that is just me. I do not think that you will like the 35's after a while with the weight. Keep them aired up to 70 or 80.
Have fun, do not jump the pipe especially on a union job but it is not polite anytime unless a guy just cannot keep up then you might not have a choice.
Always weld as if they are going to shoot it especially if they say they wont I have been bit by that before.