After watching Black Rose's youtube video where he installed these on his BSD, I thought they might be cool on an older game like Firepower to give it a little bit more of a light show.
Black Rose's video
Cointaker Page (I used the red ones)
http://shop.cointaker.com/category.sc?categoryId=172
Since Firepower has only two flashers mounted under the FIRE and POWER inserts which fire at the start of multiball or at the completion of the upper rollovers and the POWER targets, there's not much of a show. I'm sure this was impressive in 1980 and still looks cool but I just wanted to give it a little more punch.
For the sling shots I could only fit two of the three posts. The center and bottom one. The GI light next to the top post does not give enough room to fit the leads and wires without going into the play area. That leads to another problem. If you do one post that mounts an artwork plastic, you gotta do both or it's uneven. Sooo, we have just one on the center post which is tied into the sling coil and flashes when the sling fires. Not as bright as I'd like but it's still noticeable. Especially in the dark.
For the pop's I also did the same thing. Tied one post mounted flasher into the nearest bumper which lights when the bumper fires. These are more noticeable and very cool.
For the FIRE and POWER flashers I tied in four of these post flashers and mounted them behind the six center targets under the posts that mount the artwork plastics. So two on each side under the outer posts. The center post is the adjoining pop bumper flash. Of note the wiring for the flashers is reversed. One side the positive goes to the tip lug and the other side has the negative attached to the tip lug. I guess I could have just attached them all to one side since the flashers will only fire together but, I thought, putting two on each was more symmetrical and looked cleaner.
At six bucks a piece they're not cheap but Cointaker did throw in two extras in case any weren't working. Fortunately, they all were and I used all ten. Also, the Pinside discount is nice too. Sorry, no video but here's some pics. I used 22 gauge solid strand for easy installation. Note, keep your solder temp down. With as thin and light as these are, it's probably easy to damage the mounts.