[Diy_efi] Key-On Power for 7730

[Clair Davis]

Background... I've got a 69 Plymouth Valiant I'm multipoint-injecting with a
7730 box.  I've got two wires left to run, and one of them is killin' me:
Key On Power.

On my old Plymouth, the ignition switch has 5 wires: BATT, START, ACC,
IGN-1, and IGN-2.  IGN-1 is the "run" power to the coil, dropped down with a
ballast resistor to keep the coil happy.  IGN-2 is 12V straight to the coil
for hotter sparks while cranking.

The IGN-1 circuit is DEFINITELY dead while cranking, and IGN-2 is ONLY hot
while cranking.  Once the engine fires, you let up on the key, the switch
rolls back to IGN-1 and you go on about your way.  Problem is, I can't tell
how long the dead skip is in the transition between the two circuits.

Is this a problem?  Seems like it might be, as the "key on" signal seems to
be the trigger for the whole start-up routine with the ECM.  Is a GM
ignition switch one where there is no break in the power from "run" to
"start" and back, or am I overthinking things?  Mopar guys that run MSD
ignitions splice IGN-1 and IGN-2 together for the MSD to work, but that's
hardly the same animal.

Thanks in advance!

Clair