Will not start after installing an electronic fuel injector?

Ford uses a simple starter solenoid normally. To test if the issue is the solenoid or the wiring to it is simple, take a set of jumper cables and use them to shorten the two large contacts on the solenoid. Does the engine turn over now? If no go to the starter and use the cable connected to the battery side of the solenoid on the starter's battery terminal, does it turn now? No, bad starter. Next take a smaller wire and go from the large post from the battery to the small S terminal on the solenoid (where the red with light blue wire connects), does the solenoid engage and turn the engine? No, replace the solenoid. Yes, the issue is between the ignition switch and the solenoid. Try shifting to neutral, engine cranks now? Yes, bad neutral safety switch. The Red wire with light blue goes from the ignition switch through the bulkhead connector and through the neutral park switch and out to the solenoid. The other thing would be to look at the wiring to the new injection system, if you wired it directly from a switched power on the ignition switch it's possible that the load from that was more than the wiring to the switch can handle and it damaged the wiring.
Attached is the starting and charging diagram from Ford. I had to split it as it's a bit large.