You'll also may need a brake switch to cancel the cruise if you don't have one. I think it has to be a separate switch from the brake lights. I can't recall if my '84 has one but I'm pretty sure my '87XJ had two brake switches.
Good luck. I have three vehicles with non-working cruise. All my GM stuff worked forever but for some reason, Jeep and VW can't seem to keep their cruise control working.
Cruise is a must for me too. My Toyota has Radar Cruise control and it's really slick. Slows down automatically if you come up behind someone going slower than you.
1987 Jeep Cherokee Laredo, 4.0L, 4X4, Auto
1984 Jeep Grand Wagoneer, 5.9L, 4x4, Auto (newest project)
2007 Pontiac G5, 2.2L, Auto
2006 Toyota Sienna, 3.3L, Auto
2013 Toyota Matrix, 1.8L, Auto
1967 GMC 910, 283V8, 4SPD (RIP)