one pressure line (vacuum hose) from the ALDA to the intake. There is an overboost system on the cars but you shouldn't need to worry about that either. The injection pump has a governor in it that will keep everything under control. About the only thing that can go wrong is a turbo seal putting oil in the intake which could cause the engine to 'run away' . I just saw that happen on a road tractor. Blew the engine up but no one was hurt.
Paul

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84 500 SEL (307,xxx miles)