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All right guys, here's what I did.
I had to figure out how to use my existing switch and wires. The old wire that I split was the purple and black tach wire up in the trunk. I disconnected the wires to the switch and put those wires back together. Now the tach works fine and the switch is no longer connected to the tach.
I looked around in the engine compartment and tried to find a wire that I could use. I remembered the MSD comes with a theft deterrent wire. I read the instructions ( I keep everything) and it says that if you use the magnetic pick up, I think thats purple and green, you don't use the white wire. But the white wire can work as a theft deterrent if it is connected to a switch then to ground.
My existing purple and black in the engine bay is connected to the orange wire that goes to the MSD tach signal. I tried touching the white wire to that and it killed everything. I touched the white wire only to the purple and black wire and thought that would be easy but it didn't do anything. I touched it to the orange wire and the car died.
I guess you cant do that.
What I did was find an unused wire, I have plenty of them back there from the old heater blower and CIS and defogger. There was an old connector that had a green and red wire and a brown wire.
I found the green and red in the fuse block and read the cover. Bingo! it was for the old heater blower and still ran up to the trunk.
I plugged the MSD white wire into the green and red heater blower connector and then fished the green and red wire out of the fuse block. I touched that to the wires from my kill switch and one of them killed the engine.
I clamped those together and now the switch when up, runs the car. When down grounds out the MSD.
Back to normal, I like it.
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