MSD problems

highwaystar said

as I asked in original question. does the ammeter factory gauge need to get any juice at all to start and run the car, or is it just to power the factory gauges. I did pull the black negative wire off the factory ammeter gauge due to some splicing and hacking it had into other wires.

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If you have power to your ignition system the original stuff doesn't make one bit of difference.
On the other hand, if you are using your original blue/brown wires to power the ignition then the ammeter wires and associated wiring totally matters.

As I stated in a previous post "If you have power to your ignition and starting system you could rip all the wiring out of the entire car and it would still run".