Turbo overboost
 

earlier this week I was driving my 85 745 turbo diesel when I was pulling through an intersection under full throttle in 1st gear around 3500 Revs the red turbo light came on just as I was about to lift off to change to 2ndgear anyway. Tried to duplicate and was unable to. What PSI trigger this light to come on?

~11-12, maybe 15 if you adjust it all the way.