Replacing reversing lights switch

Hey up peeps...
My reversing light switch has started acting up, sometimes its fine occasionally it will not turn on when reverse is selected. Easy to know when because my reversing sensor buzzer does not beep.
I have a new spare ready to fit and looking at earlier posts it can be done without taking out the engine/gearbox.
Got a couple of questions that I hope will save me some time doing the job...well that's what the forum is for aint it?

1, Do I need to drop the oil in the gearbox, or is it over the oil level in the sump, I think it is, but just checking,
2, Is it best reached from above, through the access hatch above the engine, or from below, with the car on ramps?
3, If I need to get at it from above, is it wise to remove the air filter box before or can it be done with it in place?
4, Will it need a gasket or sealant or can it just go straight in?

Much appreciated

Sundance

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Replacing reversing lights switch