it also depends on the guage you are using aswell.
usually you should not really on the actual figure it gives you but as a guide to determine each cylinder in relation to other cylinders. i.e picking out lazy/low cylinders
i have used different guages from old to new and different brands and they will all read differently. 210 on one guage could be 180 on another etc. i have even had 2 of the same brand guages on the same engine read differently
