Coolant temp and engine coolant temperature?

Hello good afternoon,
I have a 2013 Toyota Tacoma V6 271,000 MI. My 10th gauge on the dash always stays in the exact same spot it seems to be perfect when I hook a scanner up to it and check those readings it says 185 consistently as I was looking through on the live data I noticed there's another coolant temperature that goes up and down constantly between 100 and 400 back down it's always sporadic should I be concerned? Does anyone know where the two sensors are located?

 

This looks like some Bluetooth or WiFi OBDII device and an android app.

Tell us exactly what they are.

In the meantime, I bet it is your transmission or torque converter temperature.

I think that app is wrong though. If your transmission fluid got up to 400+ degrees, it’d be fried up.

 

Engine is warm and I'm sitting in a parking lot truck in park..

 

I don't know how to upload a better video

 

Probably a scan tool bug, I wouldn't worry about it. 2nd gens only have 1 coolant temp sensor and they run a 180 degree thermostat so coolant operating temp typically stays around 175-190F

 

Cool I was thinking the ecu might tell it to maybe send more or less gas maybe... I know it sounds kinda stupid but I average between 13.5mpg and maybe just maybe on a good fill up 14mpg. Do you think that's normal? I used to run the tacoma texas edition wheels but for about 6 m months now I've been running the 20inch first gen tacoma or tundra rims and I feel like I maybe get 1mpg better.. 13.53mpg consistentlyis that normal?

 

If your lifted and/or running oversize and/or LT tires/wheels fuel mileage will definitely suffer but that does seem kinda low.

Idk what the PID is reading from but it's definitely not a temp sensor, the coolant temp sensor isn't even capable of reading anything higher than 284F and it would also set codes if it was changing back and forth that quickly.