PSI Gage?

[camper99]

I have a 08 F-350 6.4L. I had a 7.3L so this gage is new to me. I think I read this in the manual that it is not good to run at a high preasure and a long time. What would be high preasure and what would be a long time? Is this the preasure in the turbo? Thanks.

[44magnum]

Yes it is boost, I'm haven't read the "too high too long" part. Unloaded and stock (Stock meaning no tuning or other major mods) mine rarely goes above 30 usually I keep it under 20 for best mpg, loaded and stock I see low to mid 30's pretty much all the time.