The KC-135 was built in the 50s-60s. Formation strip lights were not and do not equip it. The later KC-10 has them.
And yes, there are lights that help but arent done on the model. Underbody/underwing lights shine from the #1 & 3 engine nacelles illuminate the belly and from the belly outward to the wings. Nacelle Illumination lights shine outward from the fuselage toward the wings. Lastly, at the top of the tail, the Tail Mounted Flood Light shines straight down into the AR envelope. This is adjustable in brightness.
As a receiver (KC-135RTs at McConnell were receiver capable), we would use the TMFL and Underbody lights to form a triangle with the black void of the boom pod at it's center to get into precontact, 50ft aft. Then use the PDLs (strip lights on the belly) to move in.
On the wings, The Nacelle lights were dimmed for the receivers to use and not blind them, to keep formation on the wings. Sadly, ED will need some work there.