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Scott,
Here's a wiring diagram I marked up before I did the conversion just in case I ever had to reverse out my changes. If you can make it out, the Green/Black whire goes off to the Tacho and this was connected directly to the points. This is normally at 12v and is pulled to ground when the points are closed.
To carry out the conversion I left all of the existing wiring in place but:
1) Removed the coil and replaced with a Pert Flame Thrower, it was compatible and I coulnt see how the pert switching unit would work with the internal wiring of the original blue coil. As you can see in the diagram the coil (60) has its ground side of the primary and secondary windings joined. My theory was that if you tried to switch the ground side of this coil you are also directly making and breaking the secondary coil circuit so that would put the secondary voltage through the pert and give a limited spark, if any.
2) Connected the red pert wire to the red/black wire which was removed from the left hand side of resistor 59 in the diagram and attched both of these to the +ve side of the coil
3) Connected the black pert wire to the -ve side of the coil and to the tach wire green/black.
4) Disconnected the red/purple wire from the right hand side of 59
Then physically removed the points and installed the pert into the distributor, and the old ignition box is left in place but with no power.
Hope this helps,
Gary
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