Temperature probe into coolant water
Measure the coolant temperature:
This is the way chosen by car manufacturers to read the engine temperature.
However when there any coolant leak caused by a broken hose or radiator, you cant see the overheat before a big damage on the engine.
If you choose this way take care of following:
-DO NOT OPEN the coolant circuit (will brake the pressurization)
-Must be installed BEFORE thermostat bypass.
A) Coolant Out on cylinder cover
B) Probe wire
C) Thermal insulation ( eva rubber )
D) Seal
Take care that the heat go up, but in case of a bubble the air loose thermal transfer. If is possible measure at side of hose.
A) Hose or thermostat body
B) Sensor
C) Thermal insulation
D) Coolant
E) Air bubble
