Re: dist
The shift interuptor switch grounds out the coil.
So when the switch is "made" / closed, the white wire makes contact with the Black wire (ground) by way of the switch,
So the white wire from the switch must go to the neg side /tach side of coil.
The black wire should go to a junction block where two black wires are held togeather by a long screw that screws into a ground (metal frame)
The other wire is on the insulated side of the junction block and that is where the wire from the NEG side of the coil should connect.
If you do not have a juction block then black from switch to ground, white to coil neg.