RDAC VD Reference Ground to Engine Block

On the RDAC VD, the Reference Ground wire is the bottom terminal on the RDAC, labelled REF GND. This terminal should go straight to Engine Block.

Important: Read this article on why an Engine Block Reference Ground is critical for accurate engine sender readings. If your oil temp, oil pressure and RPM / tach engine senders are not reading correctly, this is the first thing to check.

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