Power not just Vreg via the relay, but all underhood that use "ignition" power. In other words, don't snip the Vreg power wire, but tap into it there or somewhere else more convenient, like the ballast resistor upstream side.
I've got a question about this. If I have done the ammeter bypass and am hooking up the Classic HEI Kit:
I will have one relay for the GM coil power.
I will achieve this by joining the blue and brown wire from the ballast to contact 86 on my relay. Contact 87 will then have my red+ wire for the GM coil.
Do I need to add yet another relay for the ignition circuit?
That is, the circuit that ties into the voltage regulator?