Your nodes are, from what I've seen, solidly in one sign pair or the other, even if they're on the cusp. However, when you have them right at the sign cusp, it's possible for true node and mean node to be in different signs. True node and mean node are different ways of calculating the north node's position--since it's not a physical body, its location can only be determined mathematically--and they vary by up to a degree and a half. You cast this chart with true node. Try it again with mean node. If they're in the same sign, you know you're a Taurus NN for sure. If they're not, then it gets more interesting.
Astrologers differ a lot on whether true node or mean node is "more" accurate. If you have them in different signs, there's even less agreement. In that case, the best thing to do is look at what the nodes mean for you, and which sign rings truer.
One way to interpret the nodes--and Spiller touches on this but doesn't do detailed interpretations--is that the south node is your past life(s) and the north node is your future, both later in this life and for any future lives you may have. Interpret that how you will. If you believe in reincarnation, you could take that literally, and if not, then you can consider past life to mean past influences--the experiences of your ancestors, the deep down expectations you came into the world with, your early life.
By looking at the sign and house of the south node, the placement of its ruler(s), and any aspects involving the ruler, and using some creative license, we can get a once-upon-a-time past life story. It's not necessarily literally true--no way to prove that it is or isn't--but if it's the right south node story, it will feel true to you, and it will have some resemblance to your current life. Maybe not detail for detail, but certain characteristics will be the same.
If your true node and mean node are in different signs, the rulers for each would be different, and the stories we could get out of them would be quite different. To figure out which one works best for you, we'd have to explore the south node stories for both possibilities, then you could determine which fits better.
. Do you see a horseshoe glyph? Do you see a mention of true node or mean node? 
