I'm trying to get measurements on turbos and/or blowers. The engines are DD 12-71 TAB, which I'm told means "turbo, aftercooler, and bypass." The BoatDiesel guys said I can't get a reading from the individual turbos and that I should hook into the airbox after the blowers and coolers. The picture shows the suggested place - I get 0.00 psi there, and everywhere else I connect a gauge.

Even if that were to work, it wouldn't tell me anything about the individual turbos.

Any ideas - anyone?

Boost Connection.jpg