Quick Question

I am in the process of cleaning up my engine bay and had a few questions about some vacuum and electricl connectors. on the passenger side strut tower there are a few electrical connectors and vacuum fittings, what are they and are they needed if I am not running a/c, heater, or any smog stuff?
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bvut if your not running any of those items you shouldnt even need this. if you are eliminating the EGR make sure and get a custom tune to over ride it, if you dont your idle will be goofed up.