Installing temp guage sensor(aftermarket)

slantscamp said

you can get one of these t's for a radiator hose, or heater hose. this is what i have in my toyota. it worked very well.

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That would work fine if installed in a hose that had water flow at all times. EI: heater hose on a Non A/C car. A/c cars have a hot water valve that shuts down water flow in the heater hose in the "off" or "max A/C" settings.