Get the pressure checked on a gauge again . When it's at its hottest . Under load if possible although that can be a bit trickier
If it's well within spec then it's the sensor or wiring . See if there's any common issues to your model with this. For example MK2 golfs the buzzer for the circuit in the clocks used to short and set the buzzer off no matter what the pressure.
If the pressure is too low on the gauge then you can consider thicker oil but it does mean somethings worn. Although could be something non catastrophic. Eg I've had an oil filter with the relief valve stuck open before .
If it's well within spec then it's the sensor or wiring . See if there's any common issues to your model with this. For example MK2 golfs the buzzer for the circuit in the clocks used to short and set the buzzer off no matter what the pressure.
If the pressure is too low on the gauge then you can consider thicker oil but it does mean somethings worn. Although could be something non catastrophic. Eg I've had an oil filter with the relief valve stuck open before .