[FrankM_]

Apart form the gauge lights, I have the following on this circuit : 4 lights in the heater/blower controls (the 'fan light' only works if the fan is switched on position, ie I or higher) plus the harzard light switch internal light and the central locking light in the center console and if you have option M533 (alarm I think), it also provides power for the 'sign light' whatever that is (I don't have the factory alarm).

As others have said : do put an inline fuse (I used 3.5A) between the light switch 'output' of the rheostat (58a) and the three black-blue wires that provide the power to all these interior lights.