help please

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Yep, that is one half of the connector for the tab, tad, egr, and something else(mine only has 3 connected). There should be another half that plugs into it and has lines going to the egr, manifold vac source, and somewhere else(not sure, mine had everything but egr eliminated before I purchased it).
 
I just put on LT's and i know that is for vacuum lines, 2 of those go with your smog equip., i just plugged mine, i think i only have two of those holes running lines now, no problems. not sure which ones i m still using...