I did this
Pelican Technical Article: An Easy and Inexpensive Ignition Cut-Off Switch
several years ago. I had points at the time and it worked great.
Now I have changed my ignition system to a magnetic pick up distributor with a MSD6al.
The last few days my tach has not been working and just today as I was driving I realized I had the kill switch turned on.
I thought 'that's weird. the car shouldn't be starting with the kill switch turned on". I flicked the switch and the tach started working.
I was happy about that.
Problem is. Now I have a switch in my dash that only grounds the tach, no longer grounds the points.
Can you guys think of another wire that I could split and send to the switch that would work as a kill switch?
I realize I could ground my fuel pump wire and that would stop the fuel delivery, but that only kills the car after it has been driven a few miles.
I really liked the kill switch to the points.
What else up in the trunk would be a good choice to use?