TR4 brake light switch - DOT 3 to DOT 5 conversion

["J.C. Hassall" <jhassall@blacksburg.net>]

I've  replaced all components in my brake system, with the exception of the 
brake light switch, which is actuated by hydraulic pressure.  Since it was 
in contact with DOT 3 a decade+ ago, I think it's a potential fluif leak 
after I fill the system with DOT 5.  What's the list.wisdom?

TIA

Jim

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Jim
jhassall@blacksburg.net
Blacksburg VA
'63 TR4 in autox preparation, 90% finished, 90% to go