Allow high flow NEXT "power" sensor to use alternate sensor source for temp like a temp sensor connected to a OCTO. I already have a sensor on the OCTO attached to outside the case to get ambient temperature of the room the computer is in.
If you are using a room ambient temperature sensor as the input to the High Flow NEXT's external sensor, your results will be astronomically wrong.
The external input should be a coolant sensor at the OUT port of the radiator, and the High Flow NEXT should be just head of the IN for the radiator.
This will give an estimate of the power dissipated by the radiator.