You must install a boost gauge.

If they did the intallation properly, there will be a boost signal line (hard white plastic is factory) from the rear of the intake manifold to the ALDA (altitude adjuster) on the injection pump. Splice the guage into that line and see what you get.

Even a non-turbo 300D isn't a total dog -- the 240 is adequate at 70 some hp.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!