Just a guess but doesn't 9.5 to 1 mean you are compressing 1 lb to be 9.5?
So if air pressure at sea level is 14.6 than compressed 9.5 it would be
about 139.

"m Ransley" wrote in message
...
OK but what compression rating equals what lb. a factory new 9.5-1
equals how many pounds pressure with a compression tester. It has to be
a simple formula.