I have a website with some PR, but I also have another site in the exact niche. They are not linked in anyway, shape or form. However, the first site (which never actually made it to page one) got hit by penguin or panda or whatever. The second site actually outranked the first for most of the keywords.
Can I still put a sitewide or contextual link on my penalised site to my other site without hurting it? Considering the relevancy is like 100% I think it may help, but don't want to pass the penalty.