I don't know how you would use an early switch, but a switch from a later model vehicle could work, especially if it has an inch or so of mounting threads. Again you would need to make a bracket.

Here is one from a mid 80's jeep which would work:



In the same manner, a Falcon/Mustang 2 wire door switch could work too, if the appropriate bracket was made. These are also normally closed.

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Dennis
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65' STANG (3330 lbs), 393W NA, Toploader 4 Spd, 4:11, AFR 205's, Vic Jr. Intake, CI Custom SFT, 750dp, 11.0 CR

11.25@122.19mph