John, I guess your idea is use the 30 lead of relay to feed the trigger to the EFI.

althought initially it seems a good idea, remember the ballast output to the coil is allways hot, no matter the ign switch stage ( as far ballast is conected on both sides ), so even with a reduced voltage, the relay could be still being triggered at 86 lead from the ballast, so 30 lead will be getting powered from IGN2 ( 87 lead ) allways which is Also the same 86 source. There is a bucle anyway like there is no relay

The EFI system ON signal load could be SO SMALL that the coil source could work too without affect the ballast voltage HOWEVER, better use the Ign1 side, in that way the Ballast will be affected just while cranking