GRJ
Assuming the outputs are 6V, you must be stepping down from full brightness (20mA). I imagine you have tweaked these over the years and settled on a reasonable level of brightness
Rusty Traque
I looked at the closeup photo in your link and clearly the inner lights and the center red are mounted on a tilting mechanism to sweep side to side. That would be a cool effect. I may try one of the Ngineering Mars circuits that features alternating throbbing lights. That gives a pretty good Mars light effect. And set up the red to light in reverse as GRJ did.
GRJ
The Ngineering Super Mars Light Simulator NLD8031B runs on 3.2-16V DC. Do you know if the headlight (or ditch light) drivers in the PS2 board will handle the load of the flasher circuit?
Bob