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if you want to get SEO benefit from linking your own sites together you need to work very hard. there can't be anything to make your sites look like clones of each other. google looks at all kinds of things -- hosting provider, are they using the same script or HTML or CSS or JS, domain registrar and contact info, google analytics accounts, the date the sites are made, the niche/content of the sites...anything you can think of that might indicate to google the sites are basically clones of each other, you can be sure they're looking at it. Your job is to convince google your sites aren't clones of each other.
Once your sites are "associated" in googles eyes they tend to perform as a unit -- a backlink to one seems to affect the others as well, if one gets penalized they all get penalized at the same time, and google usually pick one or two domains to be the "canonical" version and rank in SERPs while the others all struggle. So at this point there probably is no benefit to interlinking them because google obviously knows they're basically the "same" site anyway -- google already sees them as linked, regardless of whether there's an actual backlink.
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