On the stock temp gauge, are the temps for H and C? such as is C 160 normal 180 and H 210? Those are just guesses, and it is a 390

 

If you want actual numbers, you have to install an aftermarket gauge. The stock gauge is too inaccurate to correlate to solid numbers. It's really meant as a relative go/no-go warning indicator. If someone really wanted to figure it out, they could test that, but I wouldn't trust it to be the same from truck to truck.

 

Ya, stock guages are not accurate. In my 75, it runs 190 to 205 on hot days and my stock gauge doesn't even get to the 1/2 way point in normal.

 

Now that I have a mechanical temp guage and can compare it to the stock guage I am thinking to myself why do I need the mechanical guage now that I know what the temps translate to on the factory one. It moves just as well as the mechanical one.

 

Agree the stock gauges are not super accurate or consistent. That said, with a 192 (factory) stat, normal temp will be about 195-200. Mine is about in the middle of the range in normal operation.

Pressurized coolant won't boil until about 250 F. I'll guess Hot is in the 230-240 range.