Volvo likes to keep things simple, such as using a vacuum/pressure gauge to determine amount of air going to the intake manifold. The MAF and MAP work together to tell the computer what the gas/air ratio should be, and the forward O2 sensor is the final judge in the correct mixture.
If you can hook up vacuum line and gauge, 1995 and earlier come with one in the instrument cluster, as did the 740T, Then you can get the proper boost level noted. A good low pressure turbo will be around 12-13psi a full boost.
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Keeping it running is better than buying new
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