Don't need to fool with the dash.

On the coil there is a white plastic connector with 2 green wires to
separate pins. Each green wire has a female spade that plugs onto a male
spade on the coil. The male spades are connected together.
Simply pull the connector off and then put it back such that the smaller
green wire's female pin isn't on a coil male spade pin any longer.

This will make the ECU green wire pulsed ground the only green wire
connected to the coil - side.

Mark