Stop in for a cup of coffee

Standard US built wiring was somehting like this
1689078229509.png

To add an ECU make it seperate. Plug and play
Put a ring terminal on the wire that replaces the points.
Put a 1/4" female on the power feed wire for the ECU.
Use a piggy back so both the original spade connector and the new one can share the tab on the ballast.

1689078822663.png

1689079012276.png

Done.