I recently purchased a new pro valve from bronco graveyard. THe old brake warning switch has 2 wires coming off of it. THe new one only has 1. I was going to put the old switch on the new valve but they will not enterchange. How do I go about hooking the 1 wire pig tail to the 2 wire pig tail. This is on a 1976 Ford F-150 2wd.
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