Thanks everyone for your replies. The car is my sons and I've had a couple of VE's but don't remember them doing this, obviously they must have. Interesting that my current VF doesn't do it.
Does anyone know what would cause the fuel gauge on a VE Omega to show a reading when the car is turned off, ie it is always active? It would appear to be providing an accurate reading. It's an Oct '06 ex cop car.