Max boost is .74 bar (10.6 PSI, I figure) so maybe the gauge is
off slightly (15%). Also, boost is limited in first gear and
you don't always get max boost all the time (it is reduced if
any engine pinging is detected or the engine is running hot, etc.).
You might check all the hoses in the intake system. I've found
one of mine loose at one point.
Also, try disconnecting the battery for a few hours to reset the
ECU. Over time, the ECU "tunes" the engine. I've found that right
after an ECU reset my 98 T5 is quite fast (and is probably making
max boost). After a few miles, it detunes a bit (probably in
response to our North American fuel).
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