Downtown: Radar guided guns where common throughout WW2: The B-25s, B-17s, Ju-88s, Betties all had them...
Ooops..my mistake..that's WB, not RL.

Seriously: With auto-gunners, why would you need radar guided guns? I guess that any OTTO-code would be more accurate than the technology of the mid/late 40s.
Of course, if AH has an otto with human limitations built in (handing over targets from 1 gun position to another, affected by Gs, no laser sight built in,...) you could get your radar guided guns.
But like I said: That's only a suggestion for the future, I want the stuff that flew in large numbers before asking for the Überbirds.
Sascha JG 77 "Herz As!"