Did anyone ever Make a nuetral safety switch for a FMX with B&M shifter in a 53?

 

when I ran a B&M shifter in my Maverick, I just wired a micro switch (mounted to the shifter braket) in so that when the switch was closed it would allow the starter relay to close and the car would start. Pretty simple to figure out, but I do not have a diagram, or pictures, sorry