Use only the specified O-ring as it is made of special material for R-134a. Use only refrigerant oil of the type required for the A/C compressor.

Typical A/C pressure transducer shown.Lubricate a new rubber O-ring seal (4) with clean refrigerant oil and install it onto the discharge line fitting (3).Install the A/C pressure transducer (2) onto the A/C discharge line. Tighten the A/C pressure transducer securely.Connect the wire harness connector (1) to the A/C pressure transducer.Reconnect the negative battery cable.