ahh...knock sensor replacement. it is located under the upper plenum.
this is a tricky job on the Z32, as the Upper Plenum is a pain in the a**. it can be done if you have the right tools and know how, but if you have no experience with cars...it will not be fun, easy, or quick. Though once you get the upper plenum off, it is smooth sailing.
if you need extra help...i can scan the pages out of my Service Manual so you do not have to spend $100+ on something you only need 2 pages out of.