727 temp gauge

TrailBeast said

Just my experience is that anything on a T doesn’t read actual temperature

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My point of a "proper T" is to place the temp probe end in the flow of fluid not off to one side of the T.

But I agree the typical T does not measure accurately.

You could also clamp a thermocouple to the outside of the tube but be sure to insulate the area for a good foot around the probe.