While something around the 150 to 190 mark can be considered normal there is more to it. Grab a calculator and multiply the highest compression reading recorded by .15. For example, if the highest reading was 160 PSI, you multiply 160 by .15 which gives you 24. Subtract 24 from your highest reading and the rest should be above that mark and be close to each other. Anything below that is considered abnormal.
Hope that helps and, welcome to the forum!
Mac
Hope that helps and, welcome to the forum!
Mac