JAGUAR XK8 - Fault Finding

Q
I own a 2000 model XK8 and a fault has developed with the red oil pressure warning light. The light appears and stays on whether the ignition is on or off . I checked the engine oil level, and the gauge says the pressure is normal when the engine is running.
I have an instrument pack wiring diagram and I note a single wire feeds the oil pressure gauge in the minor instrument pack via the major instrument pack. Could these instrument packs delay sending a message to the oil pressure warning light to cut out?

A
The oil pressure sender is simply an on/off switch that, when closed by oil pressure, should extinguish the oil pressure warning light and move the gauge to the centre position. The gauge, therefore, only indicates the presence of pressure, not the amount. If your gauge is reading correctly we would suggest looking for a fault adjacent to the lamp in the main instrument cluster.