Factory boost gauge

[Rawze]

(05-27-2017 )little john Wrote:  I have a kenworth t800 with a factory boost guage I hits 40 psi fairly easy and will stay there tell I ease off peddle . Was wondering if I should add a mechanical boost guage and see what it says before having my tune adjusted again?

(assuming it is custom tuned and de-mandated for a moment) - If I owned it, I would definitely have the boost lowered to about 36 -37 psi just for engine longevity sake.