[buzzinhalfdozen]

Ok, so basically the MSD is sending a tach signal to your EFI which it needs to indicate that in fact the engine is running. So you're still back to the basics, which can be indicated by a blinking LED, no blink, no start. I prefer the noid lights with a short pigtail on them so I can position it for easy viewing while cranking, if you have a helper this is a non issue. Look at your injector connector and get a light with similar terminals, as they've made a few different types over the years, there are some "universal" ones to chose from.Joe