From what I have read, there was a change to the TPMS used in the first ZL1s, where you need a learning tool for the TPMS used in the later ZL1s.
http://www.amazon.com/gp/product/B00...ilpage_o00_s00
You may need the nuts also.
http://www.amazon.com/gp/product/B00...ilpage_o09_s00