If you do not have the information from the computer in the evic window have you tried hooking up a device Stonehenge OBDII connector and reading the data. I have the EVIC in. Y dash and compare it to the reading intake and the one I use my BlueDriver OBDII reader list

 

Check out these two different pictures taken at the same time. You can see where the red dot is and the temp on the gun.

Hotter temp is aimed at the indented spot and other is the front flat edge mentioned before. Outside temp around 70 degrees for most of the drive.

 

One reading is directly at the the indented area on the side. The other reading appears to be from an angle on the front edge. Try the front edge from straight in front of it.

You can read from all over the pan and not know which reading is closest to what the computer sees unless you can access the data. In my case, it was the front edge, from directly in front, fairly close to the pan.

If you want to know the temperature of the fluid in the sump, I suggest you get an instrument to connect to the data port, or put a probe in the pan, wired to a gauge in the cab.

 

You need to know the FOV of the unit. You are not getting the temperature at the red dot. They take the average temperature in the Field Of View. Higher quality units have a smaller FOV. FOV gets larger as you move away from the target.

 

That makes sense

 

I did not know that.

 

I had a temp gun in the 90's for work. It had a label right on the top of the gun that gave a chart of field of view bs distance. Some people think ones that have a laser dot are only looking at the dot. Not true. It is a general area that gets larger with distance away

 

Field of view doesn't matter much when the gun is close to the part.
When I use it to read the transmission pan, it's no more than a few inches away.
When reading the exhaust stacks on our locomotives, it's no more than a few inches away.