I find it hard to believe that you can read a signal from the PCM fast enough with a Voltmeter and not a scope.
Are you telling us that you test the NON-Red leg by placing your voltmeter positive lead in the back connector and ground lead to chasis/battery grnd and you are getting a voltage signal with the key on in run engine running?
Your injector COULD not work with both leads receiving +voltage. That would be AC and your car is DC.
600rwhp at 5,000 on 9lbs before needing a clutch.
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Holley Dominator EFI, CNP ignition, tons of Holler EFI small parts, Dart 348ci, Ed Curtis cam/valvetrain, Precision 76mm, 4"dp, Viper T56, full MM Suspension, convertible cruiser.
New clutch and further tuning in the works.