Where is the neutral shifter switch on a jeep wrangler tj?

The neutral safety switch (NSS) on a Jeep Wrangler TJ is located on the top of the transmission. It's part of the transmission itself, not something easily accessible from the engine bay or under the dash. You'll need to be underneath the vehicle or possibly remove some transmission components to access it depending on the transmission type (manual vs. automatic). It's often a small switch with wires connected to it. A shop manual specific to your year and transmission type will give you the precise location and instructions.