Your '84 SD engine probably has an ARV equipped turbo, and has a vacuum line going to it. You can remove the compressor side housing, and replace it with a non-ARV housing ('83 and earlier). Or you can just remove all the vacuum related items except for the shutoff, brake booster, locks, and trans modulator. Those are the only vacuum consumers needed. Of course no vac is needed for the trans modulator if you are running a manual trans.
Also, your engine may have a rack position sensor on the IP. It is not needed to make the engine run in the W115 chassis, and can be deleted (wire cut) or just left unhooked.
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