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The factory did not use them at all until the 964 model. It is indeed the pressure sensor for high or low pressure. You will never find it on the Porsche parts list for the car as Porsche never sold it. It is like finding parts for the ABS or power steering for the SC. It does not exist.
Griffiths is a good choice. My system is the Griffith's system and he puts a T fitting in the hose where the sensor can be unscrewed and replaced without losing the refrigerant charge. Take some good photos of the line and the fitting, and we or Charlie Griffith can identify it.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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