LED taillight source...

I know this might be a bit off the mark, since in working on a 71 duster, and their tail lights are shaped different from your dart..but this is what I came up with



(not the same brand, but shows what it does)

I ordered 4 of these so I can put one in each slot of my tail lights
I figured I will run "low beam" or "running lights" on all four of them as regular brake lights
then use the inside amber "turn signals" on all four of them as brake lights, as well as the lower "high beams"
for the actual turn signal, I figured I would use the outer amber lights and the upper "high beams"

not sure yet on if I should use the upper high beams as turn or brake lights, just thinking out loud here


like I said, not exactly what your working on but I thought it might help you think down some new avenues

(specially since I'm in for less then $10.00 right now)

Thanks for the info...I will re-read it til it makes sense...
Did find the site I was thinking about....a bit more pricey than the way your going about it...https://digi-tails.com....
The Darts tail light assemblies are brand new...will be looking into your method...hate spending $$ only to put it on the shelf...