91 lincoln town car temp guage&odometor don't work. Replaced temp sensor&speedo cluster , they still don't work. Any ideals on what problem is

This link should help:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-11.html#post2043857

Testing the fuses may solve both problems.