Verification procedure
Remove the oil pressure sensor and screw it into the pressure gauge.
Fig. 2.328. Pressure gauge connection diagram
Screw the oil pressure gauge into the oil filter holder in place of the sensor (fig. 2.328).
Connect the brown wire of the oil pressure gauge to ground (–).
Connect the voltage indicator with auxiliary wires from the auxiliary and measuring tool kit to the battery (+) and the oil pressure sensor. The LED should not light up.
Start the engine and slowly increase the speed.
At an excess pressure of 0.55–0.85 bar, the LED should light up, otherwise replace the oil pressure sensor.
Increase engine speed. At 2000 min⁻¹ and oil temperature of 80°C, the excess pressure should be at least 2.0 bar.
At higher speeds, the excess oil pressure should not exceed 7.0 bar, otherwise replace the oil filter holder.
[The original can be found at vwmanual.ru]

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