Be careful in your selection of toggle switches, I tried at first with Lucas jaguar-style switches but the quality was rubbish. I went with the sealed Professional range from Holdens:

https://www.holden.co.uk/p/off_on_professional_sealed_toggle_switch_2_terminals

The only problem I had to overcome is that they don't do a hazard switch so I had to use a 6-pole twin throw and some cunning wiring to get the hazards to work correctly.

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