Superformance Brake Light Switch

[DaveM]

Anyone know the thread type for the brake light switch on Superformance GT40?

 

[Rick Muck- Mark IV]

NPT. I don't have the details where I am but use a Ford switch. Many of the aftermarket units leak/fail: https://www.ebay.com/itm/OEM-MOTORC...3480-A-FOR-FORD-LINCOLN-MERCURY-/193698196060

 

[DaveM]

Thanks Rick. The reason I'm asking is my switch is fully threaded into the brass union. That suggests 3/8 x 24 with a copper washer, but your experience says 1/8 npt?