Tacoma Temp Gauge Question

So my temp gauge has decided to quit working (stuck at the very bottom below cool) and after replacing the three parts that I thought it would be, I am now stuck on what to do next. My check engine light has not come on and therefore making this extremely hard to diagnosis without any codes to give me hints. Any help will be greatly appreciated.

I have an 02' taco with the 3RZ

So far I have replaced:
-ECT Sensor
-Thermostat
-Main O2 Sensor (Bank 1, Sensor 1)

After replacing all of these, the temp gauge is still not working and I am left clueless on what to do next. Anything I am missing? Could it be anything else?

BTW I have been using this forum for quite awhile now without ever posting (this is my first post ever) and I would just like to say thanks to anyone that has anything to do with this site. It is a blessing to say the least..

-SS
 

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