Here's a flasher setup I found at a online Auction.
The site is: Online Aution
The sellers name is Donnie and ships extremely fast.
He has other Led colors, You just have to ask for them.
The Flasher board is very small, About 1 inch x 1 inch and several different
flash modes,speeds,brightness and a connector for a external button.
He has other types of boards also.
I plan to use this in my Scrubber droid under the rear hood.
I know it's not movie correct, But it looks so cool doing the Knightrider flash.