http://www.volvoforums.org.uk/showthread.php?t=48611
The above is a very good article for changing the seals in a turbo. New seals will not make the turbo work stronger, just eliminate oil vapors entering the intake.
It is possible to get a small vacuum line from the engine to the base of the windshield. There you can temporarily tape a vacuum gauge that you can see from the driver's seat. Obviously, the nicer route would be to route the vacuum line to the dash and find a place to 'permanently' fix the gauge.
The NA version produces about 165 bhp, the LPT about 208, the HPT over 300. The 850's with HPT only had 222 bhp, but the gearing and tranny shift points were much nicer for torque.
Yes, you may have a problem with boost. My blowoff valve developed a pin hole in the bladder, that left boost at a minimum. You might also have a leak in one of the vacuum lines serving the turbo. Or, also in my case, the PO might have crossed the lines and connected them to the wrong port.
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Keeping it running is better than buying new
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