I am not sure what you mean by smart way. First of all there are two ways. However which way you use is going to be determined by what kind of diesel compression tester you have and if you have tha adaper that replaces the energy cell or if you have the adapter that takes the place of the fuel injector, 350 psi would be good with less than 50 psi variation between cylinders. Rule of thumb, if you have a lot white smoke and everything else is up to spec, you are short on compression. Also remmember cranking speed will affect compression, One thing we used to do was take and hook a battery charger up while we were making the test so the cranking speed would stay uniform from start to finish. Also how many turns of the engine does it take to reach maximum compression. Make a note on what you have say after 6 revolutions of each cylinder. Questions?