GQ TD42 oil pressure

[HigginsGQ]

Just wondering if anybody knows what is going on with my factory oil pressure gauge. im pretty sure the sender in rooted because iv got around 4 even when the car is not running just key on and then when im up in boost im reading all but 0. iv recently fitted a S/H DTS turbo kit and a bit scared that the seal between the water and oil may have blown
Cheers

[GQtdauto]

If it's any help mine starts out about 4 then gradually drops as the oil heats up but this is normal , cold oil is thicker than hot oil .