1991 Jaguar XJ6 light instrument cluster

Hello .. thanks for the donation .. much appreciated

Could you please explain which light is staying on ? .. also When ignition is OFF, odometer is permanently displayed (but not illuminated).

DESCRIPTION & OPERATION
Instrument panel contains 2 large main dials and 4 small supplementary gauges. All are conventional analog gauges, providing 90 degree movement for the 4 minor gauges and 270 degree movement for the 2 major gauges.

On XJ6, sealed and non-serviceable gauges (speedometer, tachometer, battery condition, fuel level, oil pressure and coolant temperature) are driven by Air Cored Indicators controlled by the ECU.
Odometer display works in conjunction with trip computer and Vehicle Condition Monitor (VCM). It can be displayed by pressing CLEAR button either once or twice. When ignition is OFF, odometer is permanently displayed (but not illuminated).
Twenty-two warning lights are arranged in 4 groups on the panel. There are 7 lights each at left and right sides of instrument panel and 4 lights on each side of odometer at bottom of panel.
The 7 lights on right are primary warnings and illuminate Red. The 7 lights at left are secondary warnings and illuminate Amber. Lower 8 lights are a mix of status and warning lights. A light check cycle is initiated when ignition switch is turned from OFF to ON and lasts about 5 seconds. If any light stays on after check cycle, cause should be investigated before driving vehicle. See Fig. 2 .
Fig. 2: Instrument Panel (XJ6)

Hope this helps, let me know !

There must be an damaged wire or bad line on the printed circuit bored .. you could just remove the bulb to alleviate the problem !