If you happen to lose your clutch wire or find any other reason you might need another, here's where you get one. This wire works on all 91-99 DSMs. Sorry, but the 90 model yet again does things just a little differently. This page includes some instructions that should help with getting a clutch cut wire installed on a '90. In particular, Method 1 is a GREAT choice because it's by far the simplest and quickest.
This wire is only needed on manual transmission cars (obviously) and only if you plan to use the no-lift-to-shift function and only if you still have cruise control installed in the car