eventually plan on picking up a york 210 from the junk yard, i have made up my mind on this. what i am unsure of is, what is the max safe pressure? i see many people running as high as a 150 on / 180 off switch. Kilby (who seems to be a very reliable source for new 210's and info for them) sells 120 on / 150 off switches. will running that high of pressure shorten the life of the compressor? if so, by how much?