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well...
The pregen has 12.5:1 compression, no? Atmospheric pressure is 14.about 7 psi.
12.5*14.7=183.75.
But since you're using a gauge that reads 0 psig when at atmospheric 14.7 psi, you'll need to subtract 14.7 psi.
183.75-14.7=169.05 psi showing on your compression tester gauge, assuming everything is working under ideal conditions. Given what I've read online and what I've tested, 170 psi is a good number to shoot for.
Google is a great thing.
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