I'm early in the process of attempting to retrofit the CC parts from a '94 EX 5-spd onto my '93 Del Sol S 5-spd (still need the 'On' switch from a Del Sol, though, as it is different from that on an EX).
My '94 Del Sol Si 5-spd has CC from the factory, and it works so well that I want it on my '93 (smooth control loop, no surging, holds very well). All of the part numbers from the '94 EX CC system match the part numbers for my '94 Del Sol Si, and the Del Sol S doesn't appear to need much besides wiring to for the parts to fit - all of the holes and fittings are already there, even on the steering wheel.
The first issue I've run into, which I haven't yet fully resolved, is that the set/resume switch uses the SAS's wiring cable in the steering wheel, and the cable's connector for this switch must be swapped out (there is a sort of 'dummy' connector there instead). I damaged the one from the donor car before I knew what I was doing, so need another before proceeding.
I also haven't yet verified that this SAS cable actually has all of the wires needed, but believe that it does. The CC circuit uses three of them: a power wire, which is definitely there as it is shared by the horn and I can see where it loops through the dummy connector that must be swapped out, one for the 'set' switch's signal and one for the 'resume' switch's signal. If those later two wires aren't there, then the whole SAS wire reel on the steering column has to be swapped out if you want to stick with the OEM set/resume switch.
FWIW, I too have installed a CC kit from JCWhitney many years ago - magnets had to be twist-wired onto the driveshaft for the speed sensor. While retrofitting the OEM Honda parts is not a beginner-level project, I suspect that the result is going to be superior in both performance and appearance to that particular device.
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