Aftermarket Cruise Control Questions

I just purchased a 1990 Honda Civic with an aftermarket cruise control. It's supposedly from Sears and the "brain" is by DANA (8-R family). It didn't
work at all when I started but I now have it partially working. I had to install new magnets on one of the axles for the pickup. Now it will engage but doesn't stay at the speed I set it at ... it continually accelerates. The "brain" has settings for "centering", "sensitivity" and what appears to be "low speed switch". I've fiddled with all of them and haven't gotten any improved behavior.
Does anyone have instructions from a similar unit that they could share? I'm hoping for setting/troubleshooting info.
Does anyone have adjustment steps that might help?
Any help would be greatly appreciated!
Thanks much! Dave
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Google is your friend: http://www.google.com/search?hl=en&lr=&q=cruise+control+kits&as_q na&btnG=Search%C2%A0within%C2%A0results HTH, s
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