Neutral safety switch questions ??

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Brooks James

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On the 3 pin switch is the middle pin for safety switch. I there a one wire safety switch, besides the 62-65 one which im thinking wont work in 72 up ??
 
Single pin switch up to 67 I believe. The single pin switch doesn’t work in place of the 3 pin. Middle pin is nss and can be wired as such in older wired single pin harnesses. My 95 46rh uses the 3pin and I just wired the center pin nss to my 67 harness using the 3 pin pig tail. Works great.
 
The change from 1 wire to 3 wire switch happened in spring of 68. Why in mid-year? Maybe the parts shortage was a factor. Maybe using up inventory was their delay.
Since the nose length of the switches differs, I doubt any will interchange.
 
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