My bud rick has one on his harley herritage it was splice n play back then i do know hd has more high end models now thst should be plug n play......my e-glide has one that lights up nice .....it was installed on my 97 and was plug n play......your dealer can give you specs n such but aside from the cost of the unit its all of about a half hour job if they do it so install should be affordable.....if your not equipped or mechanicly inclined id advise to let them do it.

 

Heres the tail light led

 

Search Brightasslights and you will get the answer you are looking for. No splicing wire because it has OEM plug. Just unscrew the old tail light, unplug old tail light, plug in the new tail light, and screw the BAL tail light back on. 5 minutes and your done. That is until you start playing with the settings and cannot make up your mind on what setting you like.
Basically 2 models, (not considering if you want smoke lens or a slant lens)
4 LED or 12 LED, I have the 4 which is the BAL1
3 Running light intensities and 24-28 ?? brake light patterns. All are user setably with a powerfull magnet that you just touch the top corner of the light and it activates a magnetic switch to change running or brake pattern settings.

 

Have the "Back Off" on my 2011 Cop Glide. Easy installation under the seat with one splice. Reasonably priced compared to some of the other brands.