Injector sizes?
 

I was wanting to know the biggest injector I could put in my truck with a stock turbo? I've heard 75's but wasn't sure.

2001 5.9 24valve turbo diesel 6speed

You could get away with 100's if you keep a close eye on the pyrometer.

I have a pyro but it stopped working, and I'm not sure why? Did the sensor go out or what? The pin just hangs down. But moves a little from time to time.
And if I did go with 100's I guess stomping on it would raise the pyro right? Without other mods.

upgrade your lift pump, get a fuel pressure gauge, boost gauge, a better pyro, and do you have an auto or manual trans?

stock manual trans trucks can handle 7x.010's with a boost fooler. stock auto's are a different story...

Manual trans. And I've looked into some foolery but haven't found any with any good reviews or any that have caught my eye.

better to just get a fueling/timing box that has a boost fooler built into so you don't have to buy one twice. you will need a boost elbow though to make the gate open at 35psi rather than 24-26psi.