My brake lights are working on my car, however the dashboard lights and the tail lights are not. I have changed the bulbs in the tail lights and had the fuses checked which are all good. What else could it be?

It may be a bad ignition switch/harness, which controls power to the dash lights. If you want, disconnect the negative battery cable, and check the ignition switch for wear, pitting, or melting.

The ignition switch/harness plugs into the main electrical harness and into the under-dash fuse box. Here's what's involved on a Honda:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-46563-2.html#post224652

Your Sentra should be similar.