Jeep: AMC Jeep Cruise Control tester?

My 88 XJ cruise control quit working. In the factory manual it lists a plug
in tester with LED's to troubleshoot the system without having to use a
meter with resistors inline, etc.
Does anyone know where to find one of these testers. I know that it's a long
shot, but I'd like to try to find one.
I called my dealership and of course they just said to "bring it in", which
means $500.00 bucks to lift the hood.
I don't use the cruise (Hey, it's a Jeep, right?) but the wife likes to use
it when she takes the beast out for a jaunt.
Any help or suggestions appreciated!
Thanks!
Keith



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