Ext Temperature problem

Hi guys my ext temp display showing 7F and it’s wrong I’m in California and it’s 70 degrees right now.. does anyone know how to fix this?

 

Un hook the battery for a while lol idk I’m trying to help really I am.

 

Oh man, 6.3 mpg, is that display broken as well?
I'd try the battery Un-hook as well.
Good luck!

 

Yea mine was always showing 11mpg but today showing 6 and temp is way off too.let me try un plug the battery

 

That's my real temp right now you lucky bastard!

Check this part and the connections, that it's not dirty/corrosion etc, anything that might cause a voltage drop in the circuit because it appears it is working, just not accurately.
https://parts.toyotaofcoolsprings.c...1bmRyYSZ5PTIwMTYmdD1zcjUmZT01LTdsLXY4LWdhcw==

 

Hmmm, if both are off, might be something higher up the line. Hope a battery reset does it.

 

Thanks guys the temp is good now after remove battery. ..but the mpg showing 0 now gonna drive around later and see it will go up..