OIl pressure gauge high after headunit change

[kayvee]

Turning ignition on it goes to around 120 and then once starting it's basically as far as it goes. 

 

Last two nights I’ve been putting a new head unit in and spraying the centre trim. It involved unscrewing the gauge block and screwing it back in.

Put it all back and oil pressure gauge reading really high.

 

I've tried the slap and poke and nothing happens. Could there be a wiring issue? Seems too much of a coincidence that the sensor would go in the same two days.