One hose goes on each lower connection -- should be fairly obvious by where they easily fit. The capped "connection" on the top is the vent -- when the valve is actuated, the pressure is vented out the top instead of being applied to the ALDA and increasing fuel delivered. I'll take a peak at mine tonight and see how they are connected there.

The overboost switch isn't there to prevent "eventual" overheating -- it is there to prevent overboosting and rapid destruction of the engine if the wastegate controller fails closed -- the turbo will produce about 20 psi of boost at full throttle if the wastegate stays closed, and the "effective" compression will then be high enough, with added fuel, to fail the rods, head gasket, and possibly head bolts. This engine cannot withstand that kind of boost for more than a few seconds!

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!