1932 Ford Model B Standard coupe dome lamp question.

[37 Coupe]

I think my car is considered late or at least not early with serial number B-5122586 but it does have a dash lamp and a dome lamp. I understand by the schematic that the instrument lamp is tied in with lighting circuit,head lamps or cowl lamps need to be on before dash lamp will operate but what about the dome lamp? Mine has been installed to the dash switch circuit which is fine but looking at schematic I think it shows power to dome lamp switch is the 20 amp fuse block location? Doubt I will ever drive the car at night let alone use headlamps or dome light but just something I noticed when sorting out wiring. I installed a new Rhode Island harness but not the dome lamp wiring as it looks newer plastic coated and hidden anyway.