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The water pressure sensor kit taps into the engine block's cooling passage
and converts the pressure readings to an electrical signal that is sent to the
engines' ECU. The ECU can then display this data on the tachometer. This
sensor kit is optional for Command Link Plus and Command Link, and
there are two types depending on model of the engine. These sensors plug
into harness leads that are part of the engine's wiring harness. V8 engines
come standard with a cooling water pressure sensor. (Replacement sensor: 6AW-8366B-01-00)