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"Speaking of which, anybody know what this item is?"
Vacuum transducer. They are mostly used for emission controls. I usually remove all of the vacuum consumers except for the door locks (yellow), climate control (green), engine shutoff (brown), and automatic transmission modulator (black). All other vacuum lines and valves/switches/modules are not needed (in my opinion). When they were new, I am sure they were useful and functioned as designed. Many years/miles later, they wear out and/or leak. You may find that deleting all the many meters of vac lines and fittings will give back a working central locking system, immediate engine shutoff, and smooth shifting.
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