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One question I would ask was did you measure them all at the same time under the same conditions?
If so, then yes, I could see your concern, especially with a 7psi difference.
Like most things, gauges wear out over time. I have a Longacre brand unit I bought from a race shop (Pegasus?) a coulde of years ago. I have no idea how "precise" it is after several years, but even if its within 2-3lbs it can still be good.
For regular street driving, I don't think I would worry too much. Can you "feel" the difference when driving? Do you notice unusual tire wear?
Now, if you are competing/racing, than I would prefer to start out with an accurate guage. On the other hand, its all relative. if "36" feels low, put a few more in. If "36" feels high, then let out a bit.
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1976 914 2.0
2000 Boxster 2.7 (sold)
1978 911 SC (sold)
1970 914 w/2056 (sold)
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