Re: 1946-1948 mercury question
The tube in question is for the factory optioned turn signal switch that is / was available for your car. the knockout shows the location of the switch arm when installed.
I believe this is a 48 only option and IF my memory is correct, your car may also have an ignition switch that was unique to 1948 only
I have no idea if anyone reproduces the necessary parts to refit the turn signal switch.
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