My compressor cuts off at 120 psi so I just let it pump up its tank and cut off. Then I connect it to my road bike tire for about 15 seconds and the tire is at max pressure. Now if I am filling a mtn bike tire for 55 psi, I have to be careful and make short fills and readings to make sure that I don't over pressurize the tire. I have a pressure regulator which I should install on the output line of the compressor and then I could just dial up the pressure that I want and connect it to the tire and come back later and disconnect it but that would be too easy.

So far I have been successful with my filling technique. I have also noticed that the bike shop likes to use a compressor but they do have a floor pump for customers to use.