1940 Ford Stop Light Switch
 

What is involved when replacing the stop light switch on a 40 Ford besides just unscrewing it. As guessing brake fluid will come out of the master cylinder ?

I found a used spare Borg-Warner S193 stop light switch ( has additional casing numbers on the switch, 97265 and 06 in another area ) in the trunk of the car.

Does anyone know if the S193 is a compatible replacement, as it seems to look the same?

Does anybody know how much PSI pressure is needed to close the switch, as I have nitrogen and should be able to hook it up to test.

Thank You

Joe