I have a 740 Turbo Wagon '87 with a TD05 Turbo - I was wondering what exactly the turbo gauge shows?! If you switch off the engine, the gauge goes to the 12 o'clock position - that would be 1 bar if it shows the loading pressure. But the max pressure is only 14 psi (?) and that's in a 2pm position. So does it show now the "real" loading pressure or the differnece to the surrounding pressure (what would be bad driving in high altitude)??