Green’s Dictionary of Slang

wedding tackle n.

also marriage tackle, wedding gear, ...kit
[SE wedding + tackle n.1 (1)]

the male genitals.

[UK]D’Urfey Comical Hist. of Don Quixote Pt III I i: Gadsdiggers [...] I’ll go presently, and get ready my Wedding Tackle [...] and then at night, Vather-in law – at night – oh Lord, ha, ha, ha.
[US]Trimble 5000 Adult Sex Words and Phrases 224: wedding kit (Sl.) The Genitals.
[UK]Partridge DSUE (8th edn) 1314/2: since ca. 1918.
[Aus]V. Darroch On Coast 35: Wedding gear: Male genitals.
[Ire]R. Doyle Van (1998) 574: He lifted his T-shirt, pulled in his stomach and looked down at his marriage tackle.
[UK]I. Welsh Filth 203: The guys would [...] photocopy their wedding tackle on to a sheet of paper.
[Aus]S. Maloney Something Fishy (2006) 149: How about I cut off your wedding tackle?